On the Remarkable Superconductivity of FeSe and Its Close Cousins

Kreisel, Andreas; Hirschfeld, Peter; Andersen, Brian

doi:10.3390/sym12091402

On the Remarkable Superconductivity of FeSe and Its Close Cousins

Journal Article · Sun Aug 23 00:00:00 EDT 2020 · Symmetry

DOI:https://doi.org/10.3390/sym12091402· OSTI ID:1650200

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Emergent electronic phenomena in iron-based superconductors have been at the forefront of condensed matter physics for more than a decade. Much has been learned about the origins and intertwined roles of ordered phases, including nematicity, magnetism, and superconductivity, in this fascinating class of materials. In recent years, focus has been centered on the peculiar and highly unusual properties of FeSe and its close cousins. This family of materials has attracted considerable attention due to the discovery of unexpected superconducting gap structures, a wide range of superconducting critical temperatures, and evidence for nontrivial band topology, including associated spin-helical surface states and vortex-induced Majorana bound states. Here, we review superconductivity in iron chalcogenide superconductors, including bulk FeSe, doped bulk FeSe, FeTe1−xSex, intercalated FeSe materials, and monolayer FeSe and FeTe1−xSex on SrTiO3. We focus on the superconducting properties, including a survey of the relevant experimental studies, and a discussion of the different proposed theoretical pairing scenarios. In the last part of the paper, we review the growing recent evidence for nontrivial topological effects in FeSe-related materials, focusing again on interesting implications for superconductivity.

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Research Organization:: Univ. of Florida, Gainesville, FL (United States)

Sponsoring Organization:: USDOE; USDOE Office of Science (SC)

Grant/Contract Number:: FG02-05ER46236

OSTI ID:: 1650200

Alternate ID(s):: OSTI ID: 1800322

Journal Information:: Symmetry, Journal Name: Symmetry Journal Issue: 9 Vol. 12; ISSN SYMMAM; ISSN 2073-8994

Publisher:: MDPI AGCopyright Statement

Country of Publication:: Switzerland

Language:: English

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Coexistence of isotropic and extended s -wave order parameters in FeSe as revealed by low-temperature specific heat Lin, J. -Y.; Hsieh, Y. S.; Chareev, D. A. Physical Review B, Vol. 84, Issue 22 https://doi.org/10.1103/PhysRevB.84.220507	journal	December 2011
Preemptive nematic order, pseudogap, and orbital order in the iron pnictides Fernandes, R. M.; Chubukov, A. V.; Knolle, J. Physical Review B, Vol. 85, Issue 2 https://doi.org/10.1103/PhysRevB.85.024534	journal	January 2012
Isotropic superconducting gaps with enhanced pairing on electron Fermi surfaces in FeTe 0.55 Se 0.45 Miao, H.; Richard, P.; Tanaka, Y. Physical Review B, Vol. 85, Issue 9 https://doi.org/10.1103/PhysRevB.85.094506	journal	March 2012
Anisotropic vortex lattice structures in the FeSe superconductor Hung, Hsiang-Hsuan; Song, Can-Li; Chen, Xi Physical Review B, Vol. 85, Issue 10 https://doi.org/10.1103/PhysRevB.85.104510	journal	March 2012
Reciprocal-space structure and dispersion of the magnetic resonant mode in the superconducting phase of Rb x Fe 2 − y Se 2 single crystals Friemel, G.; Park, J. T.; Maier, T. A. Physical Review B, Vol. 85, Issue 14 https://doi.org/10.1103/PhysRevB.85.140511	journal	April 2012
Adiabatic manipulations of Majorana fermions in a three-dimensional network of quantum wires Halperin, Bertrand I.; Oreg, Yuval; Stern, Ady Physical Review B, Vol. 85, Issue 14 https://doi.org/10.1103/PhysRevB.85.144501	journal	April 2012
Mechanism for a pairing state with time-reversal symmetry breaking in iron-based superconductors Platt, Christian; Thomale, Ronny; Honerkamp, Carsten Physical Review B, Vol. 85, Issue 18 https://doi.org/10.1103/PhysRevB.85.180502	journal	May 2012
Scanning tunneling microscopy/spectroscopy of vortices in LiFeAs Hanaguri, T.; Kitagawa, K.; Matsubayashi, K. Physical Review B, Vol. 85, Issue 21 https://doi.org/10.1103/PhysRevB.85.214505	journal	June 2012
Evidence for an s -wave superconducting gap in K x Fe 2 − y Se 2 from angle-resolved photoemission Xu, M.; Ge, Q. Q.; Peng, R. Physical Review B, Vol. 85, Issue 22 https://doi.org/10.1103/PhysRevB.85.220504	journal	June 2012
High-temperature superconductivity at the FeSe/SrTiO 3 interface Xiang, Yuan-Yuan; Wang, Fa; Wang, Da Physical Review B, Vol. 86, Issue 13 https://doi.org/10.1103/PhysRevB.86.134508	journal	October 2012
Orbital selectivity in Hund's metals: The iron chalcogenides Lanatà, Nicola; Strand, Hugo U. R.; Giovannetti, Gianluca Physical Review B, Vol. 87, Issue 4 https://doi.org/10.1103/PhysRevB.87.045122	journal	January 2013
Using controlled disorder to distinguish s ± and s + + gap structure in Fe-based superconductors Wang, Y.; Kreisel, A.; Hirschfeld, P. J. Physical Review B, Vol. 87, Issue 9 https://doi.org/10.1103/PhysRevB.87.094504	journal	March 2013
s + i s state with broken time-reversal symmetry in Fe-based superconductors Maiti, Saurabh; Chubukov, Andrey V. Physical Review B, Vol. 87, Issue 14 https://doi.org/10.1103/PhysRevB.87.144511	journal	April 2013
Lack of coupling between superconductivity and orthorhombic distortion in stoichiometric single-crystalline FeSe Böhmer, A. E.; Hardy, F.; Eilers, F. Physical Review B, Vol. 87, Issue 18 https://doi.org/10.1103/PhysRevB.87.180505	journal	May 2013
Atomic and electronic structures of single-layer FeSe on SrTiO 3 (001): The role of oxygen deficiency Bang, Junhyeok; Li, Zhi; Sun, Y. Y. Physical Review B, Vol. 87, Issue 22 https://doi.org/10.1103/PhysRevB.87.220503	journal	June 2013
Spin fluctuations and superconductivity in K x Fe 2 − y Se 2 Kreisel, A.; Wang, Y.; Maier, T. A. Physical Review B, Vol. 88, Issue 9 https://doi.org/10.1103/PhysRevB.88.094522	journal	September 2013
Impurity-induced subgap bound states in alkali-doped iron chalcogenide superconductors Mukherjee, Shantanu; Gastiasoro, Maria N.; Andersen, Brian M. Physical Review B, Vol. 88, Issue 13 https://doi.org/10.1103/PhysRevB.88.134508	journal	October 2013
Space group symmetry, spin-orbit coupling, and the low-energy effective Hamiltonian for iron-based superconductors Cvetkovic, Vladimir; Vafek, Oskar Physical Review B, Vol. 88, Issue 13 https://doi.org/10.1103/PhysRevB.88.134510	journal	October 2013
Spatial inhomogeneity of the superconducting gap and order parameter in FeSe 0.4 Te 0.6 Singh, U. R.; White, S. C.; Schmaus, S. Physical Review B, Vol. 88, Issue 15 https://doi.org/10.1103/PhysRevB.88.155124	journal	October 2013
Temperature dependence of lower critical field H c 1 ( T ) shows nodeless superconductivity in FeSe Abdel-Hafiez, M.; Ge, J.; Vasiliev, A. N. Physical Review B, Vol. 88, Issue 17 https://doi.org/10.1103/PhysRevB.88.174512	journal	November 2013
Superconducting gap in LiFeAs from three-dimensional spin-fluctuation pairing calculations Wang, Y.; Kreisel, A.; Zabolotnyy, V. B. Physical Review B, Vol. 88, Issue 17 https://doi.org/10.1103/PhysRevB.88.174516	journal	November 2013
Impurity states and cooperative magnetic order in Fe-based superconductors Gastiasoro, Maria N.; Hirschfeld, P. J.; Andersen, Brian M. Physical Review B, Vol. 88, Issue 22 https://doi.org/10.1103/PhysRevB.88.220509	journal	December 2013
Spin resonance in A Fe 2 Se 2 with s -wave pairing symmetry Pandey, S.; Chubukov, A. V.; Khodas, M. Physical Review B, Vol. 88, Issue 22 https://doi.org/10.1103/PhysRevB.88.224505	journal	December 2013
Interfacial effects on the spin density wave in FeSe/SrTiO 3 thin films Cao, Hai-Yuan; Tan, Shiyong; Xiang, Hongjun Physical Review B, Vol. 89, Issue 1 https://doi.org/10.1103/PhysRevB.89.014501	journal	January 2014
Doping effects of Se vacancies in monolayer FeSe Berlijn, Tom; Cheng, Hai-Ping; Hirschfeld, P. J. Physical Review B, Vol. 89, Issue 2 https://doi.org/10.1103/PhysRevB.89.020501	journal	January 2014
Complex state induced by impurities in multiband superconductors Stanev, Valentin; Koshelev, Alexei E. Physical Review B, Vol. 89, Issue 10 https://doi.org/10.1103/PhysRevB.89.100505	journal	March 2014
Superconductivity from repulsion in LiFeAs: Novel s -wave symmetry and potential time-reversal symmetry breaking Ahn, F.; Eremin, I.; Knolle, J. Physical Review B, Vol. 89, Issue 14 https://doi.org/10.1103/PhysRevB.89.144513	journal	April 2014
Reproduction of experimental gap structure in LiFeAs based on orbital-spin fluctuation theory: s + + -wave, s ± -wave, and hole- s ± -wave states Saito, Tetsuro; Onari, Seiichiro; Yamakawa, Youichi Physical Review B, Vol. 90, Issue 3 https://doi.org/10.1103/PhysRevB.90.035104	journal	July 2014
Lifting of xz / yz orbital degeneracy at the structural transition in detwinned FeSe Shimojima, T.; Suzuki, Y.; Sonobe, T. Physical Review B, Vol. 90, Issue 12 https://doi.org/10.1103/PhysRevB.90.121111	journal	September 2014
Electric transport of a single-crystal iron chalcogenide FeSe superconductor: Evidence of symmetry-breakdown nematicity and additional ultrafast Dirac cone-like carriers Huynh, K. K.; Tanabe, Y.; Urata, T. Physical Review B, Vol. 90, Issue 14 https://doi.org/10.1103/PhysRevB.90.144516	journal	October 2014
Anomalous Fermi surface in FeSe seen by Shubnikov–de Haas oscillation measurements Terashima, Taichi; Kikugawa, Naoki; Kiswandhi, Andhika Physical Review B, Vol. 90, Issue 14 https://doi.org/10.1103/PhysRevB.90.144517	journal	October 2014
Distinguishing spin-orbit coupling and nematic order in the electronic spectrum of iron-based superconductors Fernandes, Rafael M.; Vafek, Oskar Physical Review B, Vol. 90, Issue 21 https://doi.org/10.1103/PhysRevB.90.214514	journal	December 2014
Unified picture of the doping dependence of superconducting transition temperatures in alkali metal/ammonia intercalated FeSe Guterding, Daniel; Jeschke, Harald O.; Hirschfeld, P. J. Physical Review B, Vol. 91, Issue 4 https://doi.org/10.1103/PhysRevB.91.041112	journal	January 2015
Emergence of the nematic electronic state in FeSe Watson, M. D.; Kim, T. K.; Haghighirad, A. A. Physical Review B, Vol. 91, Issue 15 https://doi.org/10.1103/PhysRevB.91.155106	journal	April 2015
Resistivity and magnetoresistance of FeSe single crystals under helium-gas pressure Knöner, S.; Zielke, D.; Köhler, S. Physical Review B, Vol. 91, Issue 17 https://doi.org/10.1103/PhysRevB.91.174510	journal	May 2015
Strong ( π , 0 ) spin fluctuations in β − FeSe observed by neutron spectroscopy Rahn, M. C.; Ewings, R. A.; Sedlmaier, S. J. Physical Review B, Vol. 91, Issue 18 https://doi.org/10.1103/PhysRevB.91.180501	journal	May 2015
Observation of two distinct d x z / d y z band splittings in FeSe Zhang, P.; Qian, T.; Richard, P. Physical Review B, Vol. 91, Issue 21 https://doi.org/10.1103/PhysRevB.91.214503	journal	June 2015
Topological nature of the FeSe 0.5 Te 0.5 superconductor Wang, Zhijun; Zhang, P.; Xu, Gang Physical Review B, Vol. 92, Issue 11 https://doi.org/10.1103/PhysRevB.92.115119	journal	September 2015
Suppression of orbital ordering by chemical pressure in FeSe 1 − x S x Watson, M. D.; Kim, T. K.; Haghighirad, A. A. Physical Review B, Vol. 92, Issue 12 https://doi.org/10.1103/PhysRevB.92.121108	journal	September 2015
Competing magnetic double- Q phases and superconductivity-induced reentrance of C 2 magnetic stripe order in iron pnictides Gastiasoro, Maria N.; Andersen, Brian M. Physical Review B, Vol. 92, Issue 14 https://doi.org/10.1103/PhysRevB.92.140506	journal	October 2015
Topological superconducting states in monolayer FeSe / SrTiO 3 Hao, Ningning; Shen, Shun-Qing Physical Review B, Vol. 92, Issue 16 https://doi.org/10.1103/PhysRevB.92.165104	journal	October 2015
Robust determination of the superconducting gap sign structure via quasiparticle interference Hirschfeld, P. J.; Altenfeld, D.; Eremin, I. Physical Review B, Vol. 92, Issue 18 https://doi.org/10.1103/PhysRevB.92.184513	journal	November 2015
Momentum-dependent sign inversion of orbital order in superconducting FeSe Suzuki, Y.; Shimojima, T.; Sonobe, T. Physical Review B, Vol. 92, Issue 20 https://doi.org/10.1103/PhysRevB.92.205117	journal	November 2015
Electron pairing in the presence of incipient bands in iron-based superconductors Chen, Xiao; Maiti, S.; Linscheid, A. Physical Review B, Vol. 92, Issue 22 https://doi.org/10.1103/PhysRevB.92.224514	journal	December 2015
Spin excitations in a model of FeSe with orbital ordering Kreisel, A.; Mukherjee, Shantanu; Hirschfeld, P. J. Physical Review B, Vol. 92, Issue 22 https://doi.org/10.1103/PhysRevB.92.224515	journal	December 2015
Experimental observation of incoherent-coherent crossover and orbital-dependent band renormalization in iron chalcogenide superconductors Liu, Z. K.; Yi, M.; Zhang, Y. Physical Review B, Vol. 92, Issue 23 https://doi.org/10.1103/PhysRevB.92.235138	journal	December 2015
Critical quadrupole fluctuations and collective modes in iron pnictide superconductors Thorsmølle, V. K.; Khodas, M.; Yin, Z. P. Physical Review B, Vol. 93, Issue 5 https://doi.org/10.1103/PhysRevB.93.054515	journal	February 2016
Electron carriers with possible Dirac-cone-like dispersion in FeSe 1 − x S x ( x = 0 and 0.14) single crystals triggered by structural transition Sun, Yue; Pyon, Sunseng; Tamegai, Tsuyoshi Physical Review B, Vol. 93, Issue 10 https://doi.org/10.1103/PhysRevB.93.104502	journal	March 2016
Topological characters in Fe ( Te 1 − x Se x ) thin films Wu, Xianxin; Qin, Shengshan; Liang, Yi Physical Review B, Vol. 93, Issue 11 https://doi.org/10.1103/PhysRevB.93.115129	journal	March 2016
Interatomic Coulomb interaction and electron nematic bond order in FeSe Jiang, Kun; Hu, Jiangping; Ding, Hong Physical Review B, Vol. 93, Issue 11 https://doi.org/10.1103/PhysRevB.93.115138	journal	March 2016
Ab initio study of cross-interface electron-phonon couplings in FeSe thin films on SrTiO 3 and BaTiO 3 Wang, Y.; Linscheid, A.; Berlijn, T. Physical Review B, Vol. 93, Issue 13 https://doi.org/10.1103/PhysRevB.93.134513	journal	April 2016
Superconductivity versus bound-state formation in a two-band superconductor with small Fermi energy: Applications to Fe pnictides/chalcogenides and doped SrTiO 3 Chubukov, Andrey V.; Eremin, Ilya; Efremov, Dmitri V. Physical Review B, Vol. 93, Issue 17 https://doi.org/10.1103/PhysRevB.93.174516	journal	May 2016
Nematicity and in-plane anisotropy of superconductivity in β − FeSe detected by Se 77 nuclear magnetic resonance Baek, S. -H.; Efremov, D. V.; Ok, J. M. Physical Review B, Vol. 93, Issue 18 https://doi.org/10.1103/PhysRevB.93.180502	journal	May 2016
Magnetotransport study of the pressure-induced antiferromagnetic phase in FeSe Terashima, Taichi; Kikugawa, Naoki; Kasahara, Shigeru Physical Review B, Vol. 93, Issue 18 https://doi.org/10.1103/PhysRevB.93.180503	journal	May 2016
Role of double Ti O 2 layers at the interface of FeSe/ SrTi O 3 superconductors Zou, Ke; Mandal, Subhasish; Albright, Stephen D. Physical Review B, Vol. 93, Issue 18 https://doi.org/10.1103/PhysRevB.93.180506	journal	May 2016
Electronic vortex structure of Fe-based superconductors: Application to LiFeAs Uranga, B. Mencia; Gastiasoro, Maria N.; Andersen, Brian M. Physical Review B, Vol. 93, Issue 22 https://doi.org/10.1103/PhysRevB.93.224503	journal	June 2016
Charge transfer and electron-phonon coupling in monolayer FeSe on Nb-doped SrTiO 3 Zhou, Yuanjun; Millis, Andrew J. Physical Review B, Vol. 93, Issue 22 https://doi.org/10.1103/PhysRevB.93.224506	journal	June 2016
Superconductivity in doped Dirac semimetals Hashimoto, Tatsuki; Kobayashi, Shingo; Tanaka, Yukio Physical Review B, Vol. 94, Issue 1 https://doi.org/10.1103/PhysRevB.94.014510	journal	July 2016
Variation of transition temperatures and residual resistivity ratio in vapor-grown FeSe Böhmer, A. E.; Taufour, V.; Straszheim, W. E. Physical Review B, Vol. 94, Issue 2 https://doi.org/10.1103/PhysRevB.94.024526	journal	July 2016
Enhancement of superconducting transition temperature by pointlike disorder and anisotropic energy gap in FeSe single crystals Teknowijoyo, S.; Cho, K.; Tanatar, M. A. Physical Review B, Vol. 94, Issue 6 https://doi.org/10.1103/PhysRevB.94.064521	journal	August 2016
Distinctive orbital anisotropy observed in the nematic state of a FeSe thin film Zhang, Y.; Yi, M.; Liu, Z. -K. Physical Review B, Vol. 94, Issue 11 https://doi.org/10.1103/PhysRevB.94.115153	journal	September 2016
Absence of superconductivity in ultrathin layers of FeSe synthesized on a topological insulator Eich, Andreas; Rollfing, Nils; Arnold, Fabian Physical Review B, Vol. 94, Issue 12 https://doi.org/10.1103/PhysRevB.94.125437	journal	September 2016
Structural-transition-induced quasi-two-dimensional Fermi surface in FeSe Sun, Yue; Yamada, Tatsuhiro; Pyon, Sunseng Physical Review B, Vol. 94, Issue 13 https://doi.org/10.1103/PhysRevB.94.134505	journal	October 2016
Impact of iron-site defects on superconductivity in LiFeAs Chi, Shun; Aluru, Ramakrishna; Singh, Udai Raj Physical Review B, Vol. 94, Issue 13 https://doi.org/10.1103/PhysRevB.94.134515	journal	October 2016
Orbital-dependent Fermi surface shrinking as a fingerprint of nematicity in FeSe Fanfarillo, Laura; Mansart, Joseph; Toulemonde, Pierre Physical Review B, Vol. 94, Issue 15 https://doi.org/10.1103/PhysRevB.94.155138	journal	October 2016
Evidence for unidirectional nematic bond ordering in FeSe Watson, M. D.; Kim, T. K.; Rhodes, L. C. Physical Review B, Vol. 94, Issue 20 https://doi.org/10.1103/PhysRevB.94.201107	journal	November 2016
Phase diagram of dirty two-band superconductors and observability of impurity-induced s + i s state Silaev, Mihail; Garaud, Julien; Babaev, Egor Physical Review B, Vol. 95, Issue 2 https://doi.org/10.1103/PhysRevB.95.024517	journal	January 2017
Formation of Hubbard-like bands as a fingerprint of strong electron-electron interactions in FeSe Watson, Matthew D.; Backes, Steffen; Haghighirad, Amir A. Physical Review B, Vol. 95, Issue 8 https://doi.org/10.1103/PhysRevB.95.081106	journal	February 2017
Superconductivity and electronic fluctuations in Ba 1 − x K x Fe 2 As 2 studied by Raman scattering Wu, S. -F.; Richard, P.; Ding, H. Physical Review B, Vol. 95, Issue 8 https://doi.org/10.1103/PhysRevB.95.085125	journal	February 2017
Interplay of nematic and magnetic orders in FeSe under pressure Scherer, Daniel D.; Jacko, A. C.; Friedrich, Christoph Physical Review B, Vol. 95, Issue 9 https://doi.org/10.1103/PhysRevB.95.094504	journal	March 2017
Nematicity at the Hund's metal crossover in iron superconductors Fanfarillo, L.; Giovannetti, G.; Capone, M. Physical Review B, Vol. 95, Issue 14 https://doi.org/10.1103/PhysRevB.95.144511	journal	April 2017
Orbital selective pairing and gap structures of iron-based superconductors Kreisel, Andreas; Andersen, Brian M.; Sprau, P. O. Physical Review B, Vol. 95, Issue 17 https://doi.org/10.1103/PhysRevB.95.174504	journal	May 2017
Robustness of a quasiparticle interference test for sign-changing gaps in multiband superconductors Martiny, Johannes H. J.; Kreisel, Andreas; Hirschfeld, P. J. Physical Review B, Vol. 95, Issue 18 https://doi.org/10.1103/PhysRevB.95.184507	journal	May 2017
Strongly enhanced temperature dependence of the chemical potential in FeSe Rhodes, L. C.; Watson, M. D.; Haghighirad, A. A. Physical Review B, Vol. 95, Issue 19 https://doi.org/10.1103/PhysRevB.95.195111	journal	May 2017
Role of multiorbital effects in the magnetic phase diagram of iron pnictides Christensen, Morten H.; Scherer, Daniel D.; Kotetes, Panagiotis Physical Review B, Vol. 96, Issue 1 https://doi.org/10.1103/PhysRevB.96.014523	journal	July 2017
Superconductivity without a hole pocket in electron-doped FeSe: Analysis beyond the Migdal-Eliashberg formalism Yamakawa, Youichi; Kontani, Hiroshi Physical Review B, Vol. 96, Issue 4 https://doi.org/10.1103/PhysRevB.96.045130	journal	July 2017
Orbital superconductivity, defects, and pinned nematic fluctuations in the doped iron chalcogenide FeSe 0.45 Te 0.55 Sarkar, Saheli; Van Dyke, John; Sprau, Peter O. Physical Review B, Vol. 96, Issue 6 https://doi.org/10.1103/PhysRevB.96.060504	journal	August 2017
BCS-like critical fluctuations with limited overlap of Cooper pairs in FeSe Yang, Huan; Chen, Guanyu; Zhu, Xiyu Physical Review B, Vol. 96, Issue 6 https://doi.org/10.1103/PhysRevB.96.064501	journal	August 2017
Highly anisotropic superconducting gaps and possible evidence of antiferromagnetic order in FeSe single crystals Chen, Guan-Yu; Zhu, Xiyu; Yang, Huan Physical Review B, Vol. 96, Issue 6 https://doi.org/10.1103/PhysRevB.96.064524	journal	August 2017
Impurity-induced bound states inside the superconducting gap of FeSe Jiao, Lin; Rößler, Sahana; Koz, Cevriye Physical Review B, Vol. 96, Issue 9 https://doi.org/10.1103/PhysRevB.96.094504	journal	September 2017
Superconducting gaps in FeSe studied by soft point-contact Andreev reflection spectroscopy Naidyuk, Yu. G.; Kvitnitskaya, O. E.; Gamayunova, N. V. Physical Review B, Vol. 96, Issue 9 https://doi.org/10.1103/PhysRevB.96.094517	journal	September 2017
Anomalous temperature evolution of the electronic structure of FeSe Kushnirenko, Y. S.; Kordyuk, A. A.; Fedorov, A. V. Physical Review B, Vol. 96, Issue 10 https://doi.org/10.1103/PhysRevB.96.100504	journal	September 2017
Symmetry-unprotected nodes or gap minima in the s + + state of monocrystalline FeSe Sun, Yue; Park, Akiyoshi; Pyon, Sunseng Physical Review B, Vol. 96, Issue 14 https://doi.org/10.1103/PhysRevB.96.140505	journal	October 2017
Nematicity, magnetism, and superconductivity in FeSe under pressure: Unified explanation based on the self-consistent vertex correction theory Yamakawa, Youichi; Kontani, Hiroshi Physical Review B, Vol. 96, Issue 14 https://doi.org/10.1103/PhysRevB.96.144509	journal	October 2017
Gap structure of FeSe determined by angle-resolved specific heat measurements in applied rotating magnetic field Sun, Yue; Kittaka, Shunichiro; Nakamura, Shota Physical Review B, Vol. 96, Issue 22 https://doi.org/10.1103/PhysRevB.96.220505	journal	December 2017
Extensive impurity-scattering study on the pairing symmetry of monolayer FeSe films on SrTiO 3 Liu, Chong; Mao, Jiahao; Ding, Hao Physical Review B, Vol. 97, Issue 2 https://doi.org/10.1103/PhysRevB.97.024502	journal	January 2018
Multiband full-bandwidth anisotropic Eliashberg theory of interfacial electron-phonon coupling and high − T c superconductivity in FeSe / SrTiO 3 Aperis, Alex; Oppeneer, Peter M. Physical Review B, Vol. 97, Issue 6 https://doi.org/10.1103/PhysRevB.97.060501	journal	February 2018
Influence of disorder on the signature of the pseudogap and multigap superconducting behavior in FeSe Rößler, Sahana; Huang, Chien-Lung; Jiao, Lin Physical Review B, Vol. 97, Issue 9 https://doi.org/10.1103/PhysRevB.97.094503	journal	March 2018
Orbital mismatch boosting nematic instability in iron-based superconductors Fanfarillo, Laura; Benfatto, Lara; Valenzuela, Belén Physical Review B, Vol. 97, Issue 12 https://doi.org/10.1103/PhysRevB.97.121109	journal	March 2018
Three-dimensional superconducting gap in FeSe from angle-resolved photoemission spectroscopy Kushnirenko, Y. S.; Fedorov, A. V.; Haubold, E. Physical Review B, Vol. 97, Issue 18 https://doi.org/10.1103/PhysRevB.97.180501	journal	May 2018
Classification of symmetry derived pairing at the M point in FeSe Eugenio, P. Myles; Vafek, Oskar Physical Review B, Vol. 98, Issue 1 https://doi.org/10.1103/PhysRevB.98.014503	journal	July 2018
Properties of dirty two-band superconductors with repulsive interband interaction: Normal modes, length scales, vortices, and magnetic response Garaud, Julien; Corticelli, Alberto; Silaev, Mihail Physical Review B, Vol. 98, Issue 1 https://doi.org/10.1103/PhysRevB.98.014520	journal	July 2018
Orbital order in FeSe: The case for vertex renormalization Xing, Rui-Qi; Classen, Laura; Chubukov, Andrey V. Physical Review B, Vol. 98, Issue 4 https://doi.org/10.1103/PhysRevB.98.041108	journal	July 2018
Disorder-sensitive nodelike small gap in FeSe Sun, Yue; Kittaka, Shunichiro; Nakamura, Shota Physical Review B, Vol. 98, Issue 6 https://doi.org/10.1103/PhysRevB.98.064505	journal	August 2018
Effect of gap anisotropy on the spin resonance peak in the superconducting state of iron-based materials Korshunov, M. M. Physical Review B, Vol. 98, Issue 10 https://doi.org/10.1103/PhysRevB.98.104510	journal	September 2018
Signatures of nodeless multiband superconductivity and particle-hole crossover in the vortex cores of FeTe 0.55 Se 0.45 Berthod, Christophe Physical Review B, Vol. 98, Issue 14 https://doi.org/10.1103/PhysRevB.98.144519	journal	October 2018
Evidence of nodal gap structure in the basal plane of the FeSe superconductor Biswas, Pabitra K.; Kreisel, Andreas; Wang, Qisi Physical Review B, Vol. 98, Issue 18 https://doi.org/10.1103/PhysRevB.98.180501	journal	November 2018
Scaling of the superconducting gap with orbital character in FeSe Rhodes, Luke C.; Watson, Matthew D.; Haghighirad, Amir A. Physical Review B, Vol. 98, Issue 18 https://doi.org/10.1103/PhysRevB.98.180503	journal	November 2018
Nodal topology in d -wave superconducting monolayer FeSe Nakayama, Takeru; Shishidou, Tatsuya; Agterberg, Daniel F. Physical Review B, Vol. 98, Issue 21 https://doi.org/10.1103/PhysRevB.98.214503	journal	December 2018
Itinerant approach to magnetic neutron scattering of FeSe: Effect of orbital selectivity Kreisel, Andreas; Andersen, Brian M.; Hirschfeld, P. J. Physical Review B, Vol. 98, Issue 21 https://doi.org/10.1103/PhysRevB.98.214518	journal	December 2018
Orbital-selective superconductivity in the nematic phase of FeSe Hu, Haoyu; Yu, Rong; Nica, Emilian M. Physical Review B, Vol. 98, Issue 22 https://doi.org/10.1103/PhysRevB.98.220503	journal	December 2018
Bogoliubov Fermi surfaces: General theory, magnetic order, and topology Brydon, P. M. R.; Agterberg, D. F.; Menke, Henri Physical Review B, Vol. 98, Issue 22 https://doi.org/10.1103/PhysRevB.98.224509	journal	December 2018
Direct visualization of sign-reversal s ± superconducting gaps in FeTe 0.55 Se 0.45 Chen, Mingyang; Tang, Qingkun; Chen, Xiaoyu Physical Review B, Vol. 99, Issue 1 https://doi.org/10.1103/PhysRevB.99.014507	journal	January 2019
Theoretical study of impurity-induced magnetism in FeSe Martiny, Johannes H. J.; Kreisel, Andreas; Andersen, Brian M. Physical Review B, Vol. 99, Issue 1 https://doi.org/10.1103/PhysRevB.99.014509	journal	January 2019
Calorimetric evidence of nodal gaps in the nematic superconductor FeSe Hardy, Frédéric; He, Mingquan; Wang, Liran Physical Review B, Vol. 99, Issue 3 https://doi.org/10.1103/PhysRevB.99.035157	journal	January 2019
Higher-order topological phases: A general principle of construction Călugăru, Dumitru; Juričić, Vladimir; Roy, Bitan Physical Review B, Vol. 99, Issue 4 https://doi.org/10.1103/PhysRevB.99.041301	journal	January 2019
Superconducting Proximity Effect and Majorana Fermions at the Surface of a Topological Insulator Fu, Liang; Kane, C. L. Physical Review Letters, Vol. 100, Issue 9 https://doi.org/10.1103/PhysRevLett.100.096407	journal	March 2008
Unconventional Superconductivity with a Sign Reversal in the Order Parameter of LaFeAsO 1 − x F x Mazin, I. I.; Singh, D. J.; Johannes, M. D. Physical Review Letters, Vol. 101, Issue 5 https://doi.org/10.1103/PhysRevLett.101.057003	journal	July 2008
Unconventional Pairing Originating from the Disconnected Fermi Surfaces of Superconducting LaFeAsO 1 − x F x Kuroki, Kazuhiko; Onari, Seiichiro; Arita, Ryotaro Physical Review Letters, Vol. 101, Issue 8 https://doi.org/10.1103/PhysRevLett.101.087004	journal	August 2008
Competing Orders in FeAs Layers Lorenzana, J.; Seibold, G.; Ortix, C. Physical Review Letters, Vol. 101, Issue 18 https://doi.org/10.1103/PhysRevLett.101.186402	journal	October 2008
Why Does Undoped FeSe Become a High- T c Superconductor under Pressure? Imai, T.; Ahilan, K.; Ning, F. L. Physical Review Letters, Vol. 102, Issue 17 https://doi.org/10.1103/PhysRevLett.102.177005	journal	April 2009
Pairing State with a Time-Reversal Symmetry Breaking in FeAs-Based Superconductors Lee, Wei-Cheng; Zhang, Shou-Cheng; Wu, Congjun Physical Review Letters, Vol. 102, Issue 21 https://doi.org/10.1103/PhysRevLett.102.217002	journal	May 2009
Fermi Surface Topology and Low-Lying Quasiparticle Dynamics of Parent Fe 1 + x Te / Se Superconductor Xia, Y.; Qian, D.; Wray, L. Physical Review Letters, Vol. 103, Issue 3 https://doi.org/10.1103/PhysRevLett.103.037002	journal	July 2009
Fermi-Surface Shrinking and Interband Coupling in Iron-Based Pnictides Ortenzi, L.; Cappelluti, E.; Benfatto, L. Physical Review Letters, Vol. 103, Issue 4 https://doi.org/10.1103/PhysRevLett.103.046404	journal	July 2009
Tetragonal-to-Orthorhombic Structural Phase Transition at 90 K in the Superconductor Fe 1.01 Se McQueen, T. M.; Williams, A. J.; Stephens, P. W. Physical Review Letters, Vol. 103, Issue 5 https://doi.org/10.1103/PhysRevLett.103.057002	journal	July 2009
Majorana Fermion Induced Resonant Andreev Reflection Law, K. T.; Lee, Patrick A.; Ng, T. K. Physical Review Letters, Vol. 103, Issue 23 https://doi.org/10.1103/PhysRevLett.103.237001	journal	December 2009
Pressure Induced Static Magnetic Order in Superconducting FeSe 1 − x Bendele, M.; Amato, A.; Conder, K. Physical Review Letters, Vol. 104, Issue 8 https://doi.org/10.1103/PhysRevLett.104.087003	journal	February 2010
Strong Electron Correlations in the Normal State of the Iron-Based FeSe 0.42 Te 0.58 Superconductor Observed by Angle-Resolved Photoemission Spectroscopy Tamai, A.; Ganin, A. Y.; Rozbicki, E. Physical Review Letters, Vol. 104, Issue 9 https://doi.org/10.1103/PhysRevLett.104.097002	journal	March 2010
Angle-Resolved Photoemission Spectroscopy of the Iron-Chalcogenide Superconductor Fe 1.03 Te 0.7 Se 0.3 : Strong Coupling Behavior and the Universality of Interband Scattering Nakayama, K.; Sato, T.; Richard, P. Physical Review Letters, Vol. 105, Issue 19 https://doi.org/10.1103/PhysRevLett.105.197001	journal	November 2010
Distinct Fermi Surface Topology and Nodeless Superconducting Gap in a ( Tl 0.58 Rb 0.42 ) Fe 1.72 Se 2 Superconductor Mou, Daixiang; Liu, Shanyu; Jia, Xiaowen Physical Review Letters, Vol. 106, Issue 10 https://doi.org/10.1103/PhysRevLett.106.107001	journal	March 2011
Evolution of the Superconducting State of Fe-Based Compounds with Doping Maiti, S.; Korshunov, M. M.; Maier, T. A. Physical Review Letters, Vol. 107, Issue 14 https://doi.org/10.1103/PhysRevLett.107.147002	journal	September 2011
Friedel-Like Oscillations from Interstitial Iron in Superconducting Fe 1 + y Te 0.62 Se 0.38 Thampy, V.; Kang, J.; Rodriguez-Rivera, J. A. Physical Review Letters, Vol. 108, Issue 10 https://doi.org/10.1103/PhysRevLett.108.107002	journal	March 2012
Interpocket Pairing and Gap Symmetry in Fe-Based Superconductors with Only Electron Pockets Khodas, M.; Chubukov, A. V. Physical Review Letters, Vol. 108, Issue 24 https://doi.org/10.1103/PhysRevLett.108.247003	journal	June 2012
KFe 2 Se 2 is the Parent Compound of K-Doped Iron Selenide Superconductors Li, Wei; Ding, Hao; Li, Zhi Physical Review Letters, Vol. 109, Issue 5 https://doi.org/10.1103/PhysRevLett.109.057003	journal	July 2012
Suppression of Superconductivity by Twin Boundaries in FeSe Song, Can-Li; Wang, Yi-Lin; Jiang, Ye-Ping Physical Review Letters, Vol. 109, Issue 13 https://doi.org/10.1103/PhysRevLett.109.137004	journal	September 2012
Large Temperature Dependence of the Number of Carriers in Co-Doped BaFe 2 As 2 Brouet, V.; Lin, Ping-Hui; Texier, Y. Physical Review Letters, Vol. 110, Issue 16 https://doi.org/10.1103/PhysRevLett.110.167002	journal	April 2013
Observation of Incipient Charge Nematicity in Ba ( Fe 1 − X Co X ) 2 As 2 Gallais, Y.; Fernandes, R. M.; Paul, I. Physical Review Letters, Vol. 111, Issue 26 https://doi.org/10.1103/PhysRevLett.111.267001	journal	December 2013
Measurement of an Enhanced Superconducting Phase and a Pronounced Anisotropy of the Energy Gap of a Strained FeSe Single Layer in FeSe / Nb : SrTiO 3 / KTaO 3 Heterostructures Using Photoemission Spectroscopy Peng, R.; Shen, X. P.; Xie, X. Physical Review Letters, Vol. 112, Issue 10 https://doi.org/10.1103/PhysRevLett.112.107001	journal	March 2014
Selective Mott Physics as a Key to Iron Superconductors de’ Medici, Luca; Giovannetti, Gianluca; Capone, Massimo Physical Review Letters, Vol. 112, Issue 17 https://doi.org/10.1103/PhysRevLett.112.177001	journal	April 2014
Reconstruction of Band Structure Induced by Electronic Nematicity in an FeSe Superconductor Nakayama, K.; Miyata, Y.; Phan, G. N. Physical Review Letters, Vol. 113, Issue 23 https://doi.org/10.1103/PhysRevLett.113.237001	journal	December 2014
Origin of the Tetragonal-to-Orthorhombic Phase Transition in FeSe: A Combined Thermodynamic and NMR Study of Nematicity Böhmer, A. E.; Arai, T.; Hardy, F. Physical Review Letters, Vol. 114, Issue 2 https://doi.org/10.1103/PhysRevLett.114.027001	journal	January 2015
Model of Electronic Structure and Superconductivity in Orbitally Ordered FeSe Mukherjee, Shantanu; Kreisel, A.; Hirschfeld, P. J. Physical Review Letters, Vol. 115, Issue 2 https://doi.org/10.1103/PhysRevLett.115.026402	journal	July 2015
Dichotomy between the Hole and Electron Behavior in Multiband Superconductor FeSe Probed by Ultrahigh Magnetic Fields Watson, M. D.; Yamashita, T.; Kasahara, S. Physical Review Letters, Vol. 115, Issue 2 https://doi.org/10.1103/PhysRevLett.115.027006	journal	July 2015
Antiferroquadrupolar and Ising-Nematic Orders of a Frustrated Bilinear-Biquadratic Heisenberg Model and Implications for the Magnetism of FeSe Yu, Rong; Si, Qimiao Physical Review Letters, Vol. 115, Issue 11 https://doi.org/10.1103/PhysRevLett.115.116401	journal	September 2015
Topological Superconductivity in Dirac Semimetals Kobayashi, Shingo; Sato, Masatoshi Physical Review Letters, Vol. 115, Issue 18 https://doi.org/10.1103/PhysRevLett.115.187001	journal	October 2015
Nematic Resonance in the Raman Response of Iron-Based Superconductors Gallais, Yann; Paul, Indranil; Chauvière, Ludivine Physical Review Letters, Vol. 116, Issue 1 https://doi.org/10.1103/PhysRevLett.116.017001	journal	January 2016
Evolution of High-Temperature Superconductivity from a Low- T c Phase Tuned by Carrier Concentration in FeSe Thin Flakes Lei, B.; Cui, J. H.; Xiang, Z. J. Physical Review Letters, Vol. 116, Issue 7 https://doi.org/10.1103/PhysRevLett.116.077002	journal	February 2016
Observation of Double-Dome Superconductivity in Potassium-Doped FeSe Thin Films Song, Can-Li; Zhang, Hui-Min; Zhong, Yong Physical Review Letters, Vol. 116, Issue 15 https://doi.org/10.1103/PhysRevLett.116.157001	journal	April 2016
Spin Ferroquadrupolar Order in the Nematic Phase of FeSe Wang, Zhentao; Hu, Wen-Jun; Nevidomskyy, Andriy H. Physical Review Letters, Vol. 116, Issue 24 https://doi.org/10.1103/PhysRevLett.116.247203	journal	June 2016
Majorana Zero Mode Detected with Spin Selective Andreev Reflection in the Vortex of a Topological Superconductor Sun, Hao-Hua; Zhang, Kai-Wen; Hu, Lun-Hui Physical Review Letters, Vol. 116, Issue 25 https://doi.org/10.1103/PhysRevLett.116.257003	journal	June 2016
Topological Superconductivity on the Surface of Fe-Based Superconductors Xu, Gang; Lian, Biao; Tang, Peizhe Physical Review Letters, Vol. 117, Issue 4 https://doi.org/10.1103/PhysRevLett.117.047001	journal	July 2016
High-Temperature Superconductivity in Single-Unit-Cell FeSe Films on Anatase TiO 2 ( 001 ) Ding, Hao; Lv, Yan-Feng; Zhao, Kun Physical Review Letters, Vol. 117, Issue 6 https://doi.org/10.1103/PhysRevLett.117.067001	journal	August 2016
High T c via Spin Fluctuations from Incipient Bands: Application to Monolayers and Intercalates of FeSe Linscheid, A.; Maiti, S.; Wang, Y. Physical Review Letters, Vol. 117, Issue 7 https://doi.org/10.1103/PhysRevLett.117.077003	journal	August 2016
Thermal Conductivity of the Iron-Based Superconductor FeSe: Nodeless Gap with a Strong Two-Band Character Bourgeois-Hope, P.; Chi, S.; Bonn, D. A. Physical Review Letters, Vol. 117, Issue 9 https://doi.org/10.1103/PhysRevLett.117.097003	journal	August 2016
Superconducting Gap Anisotropy in Monolayer FeSe Thin Film Zhang, Y.; Lee, J. J.; Moore, R. G. Physical Review Letters, Vol. 117, Issue 11 https://doi.org/10.1103/PhysRevLett.117.117001	journal	September 2016
Highly Anisotropic and Twofold Symmetric Superconducting Gap in Nematically Ordered FeSe 0.93 S 0.07 Xu, H. C.; Niu, X. H.; Xu, D. F. Physical Review Letters, Vol. 117, Issue 15 https://doi.org/10.1103/PhysRevLett.117.157003	journal	October 2016
Superconductivity in FeSe Thin Films Driven by the Interplay between Nematic Fluctuations and Spin-Orbit Coupling Kang, Jian; Fernandes, Rafael M. Physical Review Letters, Vol. 117, Issue 21 https://doi.org/10.1103/PhysRevLett.117.217003	journal	November 2016
Hund Interaction, Spin-Orbit Coupling, and the Mechanism of Superconductivity in Strongly Hole-Doped Iron Pnictides Vafek, Oskar; Chubukov, Andrey V. Physical Review Letters, Vol. 118, Issue 8 https://doi.org/10.1103/PhysRevLett.118.087003	journal	February 2017
Bogoliubov Fermi Surfaces in Superconductors with Broken Time-Reversal Symmetry Agterberg, D. F.; Brydon, P. M. R.; Timm, C. Physical Review Letters, Vol. 118, Issue 12 https://doi.org/10.1103/PhysRevLett.118.127001	journal	March 2017
Lattice Effects on Nematic Quantum Criticality in Metals Paul, I.; Garst, M. Physical Review Letters, Vol. 118, Issue 22 https://doi.org/10.1103/PhysRevLett.118.227601	journal	June 2017
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71 CLASSICAL AND QUANTUM MECHANICS
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superconducting pairing
topological superconductivity
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On the Remarkable Superconductivity of FeSe and Its Close Cousins

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