Gap symmetry and structure of Fe-based superconductors

Hirschfeld, P. J.; Korshunov, M. M.; Mazin, I. I.

doi:10.1088/0034-4885/74/12/124508

Gap symmetry and structure of Fe-based superconductors

Journal Article · Thu Oct 13 00:00:00 EDT 2011 · Reports on Progress in Physics

DOI:https://doi.org/10.1088/0034-4885/74/12/124508· OSTI ID:2484138

Hirschfeld, P. J. ^[1]; Korshunov, M. M. ^[2]; Mazin, I. I. ^[3]

University of Florida, Gainesville, FL (United States)
University of Florida, Gainesville, FL (United States); Siberian Branch of Russian Academy of Sciences, Krasnoyarsk (Russia)
Naval Research Laboratory, Washington, DC (United States)

The recently discovered Fe pnictide and chalcogenide superconductors display low temperature properties suggesting superconducting gap structures which appear to vary substantially from family to family, and even within family as a function of doping or pressure. We propose that this apparent nonuniversality can actually be understood by considering the predictions of spin fluctuation theory and accounting for the peculiar electronic structure of these systems, coupled with the likely “sign-changing s-wave” (s_±) symmetry. Here, we review theoretical aspects, materials properties, and experimental evidence relevant to this suggestion, and discuss which further measurements would be useful to settle these issues.

View Accepted Manuscript (DOE)

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

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: FG02-05ER46236

OSTI ID:: 2484138

Alternate ID(s):: OSTI ID: 22041686

Journal Information:: Reports on Progress in Physics, Journal Name: Reports on Progress in Physics Journal Issue: 12 Vol. 74; ISSN 0034-4885

Publisher:: IOP PublishingCopyright Statement

Country of Publication:: United States

Language:: English

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Nonexponential London penetration depth of external magnetic fields in superconducting Ba 1 − x K x Fe 2 As 2 single crystals Martin, C.; Gordon, R. T.; Tanatar, M. A. Physical Review B, Vol. 80, Issue 2 https://doi.org/10.1103/PhysRevB.80.020501	journal	July 2009
Valley density-wave and multiband superconductivity in iron-based pnictide superconductors Cvetkovic, Vladimir; Tesanovic, Zlatko Physical Review B, Vol. 80, Issue 2 https://doi.org/10.1103/PhysRevB.80.024512	journal	July 2009
Multigap nodeless superconductivity in FeSe x : Evidence from quasiparticle heat transport Dong, J. K.; Guan, T. Y.; Zhou, S. Y. Physical Review B, Vol. 80, Issue 2 https://doi.org/10.1103/PhysRevB.80.024518	journal	July 2009
Impurity-induced bound states in iron-based superconductors with s -wave cos k x ⋅ cos k y pairing symmetry Tsai, Wei-Feng; Zhang, Yan-Yang; Fang, Chen Physical Review B, Vol. 80, Issue 6 https://doi.org/10.1103/PhysRevB.80.064513	journal	August 2009
Dynamical mean-field theory within an augmented plane-wave framework: Assessing electronic correlations in the iron pnictide LaFeAsO Aichhorn, Markus; Pourovskii, Leonid; Vildosola, Veronica Physical Review B, Vol. 80, Issue 8 https://doi.org/10.1103/PhysRevB.80.085101	journal	August 2009
Quasiparticle scattering interference in superconducting iron pnictides Zhang, Yan-Yang; Fang, Chen; Zhou, Xiaoting Physical Review B, Vol. 80, Issue 9 https://doi.org/10.1103/PhysRevB.80.094528	journal	September 2009
Coexistence of superconductivity and a spin-density wave in pnictide superconductors: Gap symmetry and nodal lines Parker, D.; Vavilov, M. G.; Chubukov, A. V. Physical Review B, Vol. 80, Issue 10 https://doi.org/10.1103/PhysRevB.80.100508	journal	September 2009
In-gap bound states induced by nonmagnetic impurities in two-band s ± superconductors Ng, T. K.; Avishai, Y. Physical Review B, Vol. 80, Issue 10 https://doi.org/10.1103/PhysRevB.80.104504	journal	September 2009
Effects of cobalt doping and three-dimensionality in BaFe 2 As 2 Kemper, A. F.; Cao, C.; Hirschfeld, P. J. Physical Review B, Vol. 80, Issue 10 https://doi.org/10.1103/PhysRevB.80.104511	journal	September 2009
Atomic coexistence of superconductivity and incommensurate magnetic order in the pnictide Ba ( Fe 1 − x Co x ) 2 As 2 Laplace, Y.; Bobroff, J.; Rullier-Albenque, F. Physical Review B, Vol. 80, Issue 14 https://doi.org/10.1103/PhysRevB.80.140501	journal	October 2009
Quasiparticle heat transport in single-crystalline Ba 1 − x K x Fe 2 As 2 : Evidence for a k -dependent superconducting gap without nodes Luo, X. G.; Tanatar, M. A.; Reid, J. -Ph. Physical Review B, Vol. 80, Issue 14 https://doi.org/10.1103/PhysRevB.80.140503	journal	October 2009
Momentum dependence and nodes of the superconducting gap in the iron pnictides Chubukov, A. V.; Vavilov, M. G.; Vorontsov, A. B. Physical Review B, Vol. 80, Issue 14 https://doi.org/10.1103/PhysRevB.80.140515	journal	October 2009
Model for nodal quasiparticle scattering in a disordered vortex lattice Maltseva, Marianna; Coleman, P. Physical Review B, Vol. 80, Issue 14 https://doi.org/10.1103/PhysRevB.80.144514	journal	October 2009
Nesting between hole and electron pockets in Ba ( Fe 1 − x Co x ) 2 As 2 ( x = 0 – 0.3 ) observed with angle-resolved photoemission Brouet, V.; Marsi, M.; Mansart, B. Physical Review B, Vol. 80, Issue 16 https://doi.org/10.1103/PhysRevB.80.165115	journal	October 2009
Functional renormalization-group study of the doping dependence of pairing symmetry in the iron pnictide superconductors Thomale, Ronny; Platt, Christian; Hu, Jiangping Physical Review B, Vol. 80, Issue 18 https://doi.org/10.1103/PhysRevB.80.180505	journal	November 2009
Band- and momentum-dependent electron dynamics in superconducting Ba ( Fe 1 − x Co x ) 2 As 2 as seen via electronic Raman scattering Muschler, B.; Prestel, W.; Hackl, R. Physical Review B, Vol. 80, Issue 18 https://doi.org/10.1103/PhysRevB.80.180510	journal	November 2009
Pair breaking in iron pnictides Kogan, V. G. Physical Review B, Vol. 80, Issue 21 https://doi.org/10.1103/PhysRevB.80.214532	journal	December 2009
Phonons in doped and undoped BaFe 2 As 2 investigated by inelastic x-ray scattering Reznik, D.; Lokshin, K.; Mitchell, D. C. Physical Review B, Vol. 80, Issue 21 https://doi.org/10.1103/PhysRevB.80.214534	journal	December 2009
Thermal conductivity measurements of the energy-gap anisotropy of superconducting LaFePO at low temperatures Yamashita, M.; Nakata, N.; Senshu, Y. Physical Review B, Vol. 80, Issue 22 https://doi.org/10.1103/PhysRevB.80.220509	journal	December 2009
Theory of thermal conductivity in extended- s state superconductors: Application to ferropnictides Mishra, V.; Vorontsov, A.; Hirschfeld, P. J. Physical Review B, Vol. 80, Issue 22 https://doi.org/10.1103/PhysRevB.80.224525	journal	December 2009
Three orbital model for the iron-based superconductors Daghofer, Maria; Nicholson, Andrew; Moreo, Adriana Physical Review B, Vol. 81, Issue 1 https://doi.org/10.1103/PhysRevB.81.014511	journal	January 2010
Magnetic impurity resonance states and symmetry of the superconducting order parameter in iron-based superconductors Akbari, Alireza; Eremin, Ilya; Thalmeier, Peter Physical Review B, Vol. 81, Issue 1 https://doi.org/10.1103/PhysRevB.81.014524	journal	January 2010
P 31 and A 75 s NMR evidence for a residual density of states at zero energy in superconducting BaFe 2 ( As 0.67 P 0.33 ) 2 Nakai, Yusuke; Iye, Tetsuya; Kitagawa, Shunsaku Physical Review B, Vol. 81, Issue 2 https://doi.org/10.1103/PhysRevB.81.020503	journal	January 2010
Magnetic degeneracy and hidden metallicity of the spin-density-wave state in ferropnictides Eremin, I.; Chubukov, A. V. Physical Review B, Vol. 81, Issue 2 https://doi.org/10.1103/PhysRevB.81.024511	journal	January 2010
Phase diagram and gap anisotropy in iron-pnictide superconductors Ikeda, Hiroaki; Arita, Ryotaro; Kuneš, Jan Physical Review B, Vol. 81, Issue 5 https://doi.org/10.1103/PhysRevB.81.054502	journal	February 2010
Two types of s -wave pairing due to magnetic and orbital fluctuations in the two-dimensional 16-band d − p model for iron-based superconductors Yanagi, Yuki; Yamakawa, Youichi; Ōno, Yoshiaki Physical Review B, Vol. 81, Issue 5 https://doi.org/10.1103/PhysRevB.81.054518	journal	February 2010
Structure of neutron-scattering peaks in both s + + -wave and s ± -wave states of an iron pnictide superconductor Onari, Seiichiro; Kontani, Hiroshi; Sato, Masatoshi Physical Review B, Vol. 81, Issue 6 https://doi.org/10.1103/PhysRevB.81.060504	journal	February 2010
Evidence from anisotropic penetration depth for a three-dimensional nodal superconducting gap in single-crystalline Ba ( Fe 1 − x Ni x ) 2 As 2 Martin, C.; Kim, H.; Gordon, R. T. Physical Review B, Vol. 81, Issue 6 https://doi.org/10.1103/PhysRevB.81.060505	journal	February 2010
Theory of itinerant magnetic excitations in the spin-density-wave phase of iron-based superconductors Knolle, J.; Eremin, I.; Chubukov, A. V. Physical Review B, Vol. 81, Issue 14 https://doi.org/10.1103/PhysRevB.81.140506	journal	April 2010
A 75 s nuclear magnetic resonance study of antiferromagnetic fluctuations in the normal state of LiFeAs Jeglič, P.; Potočnik, A.; Klanjšek, M. Physical Review B, Vol. 81, Issue 14 https://doi.org/10.1103/PhysRevB.81.140511	journal	April 2010
Nodes in the gap function of LaFePO, the gap function of the Fe(Se,Te) systems, and the STM signature of the s ± pairing Wang, Fa; Zhai, Hui; Lee, Dung-Hai Physical Review B, Vol. 81, Issue 18 https://doi.org/10.1103/PhysRevB.81.184512	journal	May 2010
Evolution from non-Fermi- to Fermi-liquid transport via isovalent doping in BaFe 2 ( As 1 − x P x ) 2 superconductors Kasahara, S.; Shibauchi, T.; Hashimoto, K. Physical Review B, Vol. 81, Issue 18 https://doi.org/10.1103/PhysRevB.81.184519	journal	May 2010
Spin fluctuations and superconductivity in a three-dimensional tight-binding model for BaFe 2 As 2 Graser, S.; Kemper, A. F.; Maier, T. A. Physical Review B, Vol. 81, Issue 21 https://doi.org/10.1103/PhysRevB.81.214503	journal	June 2010
Specific heat versus field in the 30 K superconductor BaFe 2 ( As 0.7 P 0.3 ) 2 Kim, J. S.; Hirschfeld, P. J.; Stewart, G. R. Physical Review B, Vol. 81, Issue 21 https://doi.org/10.1103/PhysRevB.81.214507	journal	June 2010
Line nodes in the energy gap of superconducting BaFe 2 ( As 1 − x P x ) 2 single crystals as seen via penetration depth and thermal conductivity Hashimoto, K.; Yamashita, M.; Kasahara, S. Physical Review B, Vol. 81, Issue 22 https://doi.org/10.1103/PhysRevB.81.220501	journal	June 2010
Incommensurate itinerant antiferromagnetic excitations and spin resonance in the FeTe 0.6 Se 0.4 superconductor Argyriou, D. N.; Hiess, A.; Akbari, A. Physical Review B, Vol. 81, Issue 22 https://doi.org/10.1103/PhysRevB.81.220503	journal	June 2010
Statistics of the subgap states of s ± superconductors Glatz, A.; Koshelev, A. E. Physical Review B, Vol. 82, Issue 1 https://doi.org/10.1103/PhysRevB.82.012507	journal	July 2010
Competing order and nature of the pairing state in the iron pnictides Fernandes, Rafael M.; Schmalian, Jörg Physical Review B, Vol. 82, Issue 1 https://doi.org/10.1103/PhysRevB.82.014521	journal	July 2010
Evidence for superconducting gap nodes in the zone-centered hole bands of KFe 2 As 2 from magnetic penetration-depth measurements Hashimoto, K.; Serafin, A.; Tonegawa, S. Physical Review B, Vol. 82, Issue 1 https://doi.org/10.1103/PhysRevB.82.014526	journal	July 2010
Effects of magnetism and doping on the electron-phonon coupling in BaFe 2 As 2 Boeri, L.; Calandra, M.; Mazin, I. I. Physical Review B, Vol. 82, Issue 2 https://doi.org/10.1103/PhysRevB.82.020506	journal	July 2010
Doping dependence of spin fluctuations and electron correlations in iron pnictides Ikeda, Hiroaki; Arita, Ryotaro; Kuneš, Jan Physical Review B, Vol. 82, Issue 2 https://doi.org/10.1103/PhysRevB.82.024508	journal	July 2010
Angle-resolved specific heat in iron-based superconductors: The case for a nodeless extended s -wave gap Chubukov, A. V.; Eremin, I. Physical Review B, Vol. 82, Issue 6 https://doi.org/10.1103/PhysRevB.82.060504	journal	August 2010
London penetration depth in Ba ( Fe 1 − x T x ) 2 As 2 ( T = Co , Ni ) superconductors irradiated with heavy ions Kim, H.; Gordon, R. T.; Tanatar, M. A. Physical Review B, Vol. 82, Issue 6 https://doi.org/10.1103/PhysRevB.82.060518	journal	August 2010
Nodes in the gap structure of the iron arsenide superconductor Ba ( Fe 1 − x Co x ) 2 As 2 from c -axis heat transport measurements Reid, J. -Ph.; Tanatar, M. A.; Luo, X. G. Physical Review B, Vol. 82, Issue 6 https://doi.org/10.1103/PhysRevB.82.064501	journal	August 2010
Theoretical evidence for strong correlations and incoherent metallic state in FeSe Aichhorn, Markus; Biermann, Silke; Miyake, Takashi Physical Review B, Vol. 82, Issue 6 https://doi.org/10.1103/PhysRevB.82.064504	journal	August 2010
Anisotropic neutron spin resonance in superconducting BaFe 1.9 Ni 0.1 As 2 Lipscombe, O. J.; Harriger, Leland W.; Freeman, P. G. Physical Review B, Vol. 82, Issue 6 https://doi.org/10.1103/PhysRevB.82.064515	journal	August 2010
Precision microwave electrodynamic measurements of K- and Co-doped BaFe 2 As 2 Bobowski, J. S.; Baglo, J. C.; Day, James Physical Review B, Vol. 82, Issue 9 https://doi.org/10.1103/PhysRevB.82.094520	journal	September 2010
Symmetry of spin excitation spectra in the tetragonal paramagnetic and superconducting phases of 122-ferropnictides Park, J. T.; Inosov, D. S.; Yaresko, A. Physical Review B, Vol. 82, Issue 13 https://doi.org/10.1103/PhysRevB.82.134503	journal	October 2010
Effect of disorder on the electronic Raman scattering in the superconducting state of iron pnictides Boyd, G. R.; Hirschfeld, P. J.; Devereaux, T. P. Physical Review B, Vol. 82, Issue 13 https://doi.org/10.1103/PhysRevB.82.134506	journal	October 2010
Pairing symmetry of the multiorbital pnictide superconductor BaFe 1.84 Co 0.16 As 2 from Raman scattering Sugai, S.; Mizuno, Y.; Kiho, K. Physical Review B, Vol. 82, Issue 14 https://doi.org/10.1103/PhysRevB.82.140504	journal	October 2010
Orbital fluctuation theory in iron pnictides: Effects of As-Fe-As bond angle, isotope substitution, and Z 2 -orbital pocket on superconductivity Saito, Tetsuro; Onari, Seiichiro; Kontani, Hiroshi Physical Review B, Vol. 82, Issue 14 https://doi.org/10.1103/PhysRevB.82.144510	journal	October 2010
Pinpointing gap minima in Ba ( Fe 0.94 Co 0.06 ) 2 As 2 via band-structure calculations and electronic Raman scattering Mazin, I. I.; Devereaux, T. P.; Analytis, J. G. Physical Review B, Vol. 82, Issue 18 https://doi.org/10.1103/PhysRevB.82.180502	journal	November 2010
Superconductivity in the iron selenide K x Fe 2 Se 2 ( 0 ≤ x ≤ 1.0 ) Guo, Jiangang; Jin, Shifeng; Wang, Gang Physical Review B, Vol. 82, Issue 18 https://doi.org/10.1103/PhysRevB.82.180520	journal	November 2010
Impact of the spin-density-wave order on the superconducting gap of Ba ( Fe 1 − x Co x ) 2 As 2 Chauvière, L.; Gallais, Y.; Cazayous, M. Physical Review B, Vol. 82, Issue 18 https://doi.org/10.1103/PhysRevB.82.180521	journal	November 2010
Absence of surface states for LiFeAs investigated using density functional calculations Lankau, Alexander; Koepernik, Klaus; Borisenko, Sergey Physical Review B, Vol. 82, Issue 18 https://doi.org/10.1103/PhysRevB.82.184518	journal	November 2010
Quasiparticle interference in iron-based superconductors Akbari, A.; Knolle, J.; Eremin, I. Physical Review B, Vol. 82, Issue 22 https://doi.org/10.1103/PhysRevB.82.224506	journal	December 2010
Erratum: Pairing symmetry of the multiorbital pnictide superconductor BaFe1.84Co0.16As2from Raman scattering [Phys. Rev. B82, 140504(R) (2010)] Sugai, S.; Mizuno, Y.; Kiho, K. Physical Review B, Vol. 83, Issue 1 https://doi.org/10.1103/PhysRevB.83.019903	journal	January 2011
Quasiparticle interference in antiferromagnetic parent compounds of iron-based superconductors Mazin, I. I.; Kimber, Simon A. J.; Argyriou, Dimitri N. Physical Review B, Vol. 83, Issue 5 https://doi.org/10.1103/PhysRevB.83.052501	journal	February 2011
Theory of magnetism and triplet superconductivity in LiFeAs Brydon, P. M. R.; Daghofer, Maria; Timm, Carsten Physical Review B, Vol. 83, Issue 6 https://doi.org/10.1103/PhysRevB.83.060501	journal	February 2011
Effect of annealing on the specific heat of Ba(Fe 1 − x Co x ) 2 As 2 Gofryk, K.; Vorontsov, A. B.; Vekhter, I. Physical Review B, Vol. 83, Issue 6 https://doi.org/10.1103/PhysRevB.83.064513	journal	February 2011
Nodeless two-gap superconducting state in single crystals of the stoichiometric iron pnictide LiFeAs Kim, H.; Tanatar, M. A.; Song, Yoo Jang Physical Review B, Vol. 83, Issue 10 https://doi.org/10.1103/PhysRevB.83.100502	journal	March 2011
d -wave pairing from spin fluctuations in the K x Fe 2 − y Se 2 superconductors Maier, T. A.; Graser, S.; Hirschfeld, P. J. Physical Review B, Vol. 83, Issue 10 https://doi.org/10.1103/PhysRevB.83.100515	journal	March 2011
Structure of vacancy-ordered single-crystalline superconducting potassium iron selenide Zavalij, P.; Bao, Wei; Wang, X. F. Physical Review B, Vol. 83, Issue 13 https://doi.org/10.1103/PhysRevB.83.132509	journal	April 2011
Nodeless energy gaps of single-crystalline Ba 0 . 68 K 0 . 32 Fe 2 As 2 as seen via As 75 NMR Li, Z.; Sun, D. L.; Lin, C. T. Physical Review B, Vol. 83, Issue 14 https://doi.org/10.1103/PhysRevB.83.140506	journal	April 2011
Emergence of fully gapped s + + -wave and nodal d -wave states mediated by orbital and spin fluctuations in a ten-orbital model of KFe 2 Se 2 Saito, Tetsuro; Onari, Seiichiro; Kontani, Hiroshi Physical Review B, Vol. 83, Issue 14 https://doi.org/10.1103/PhysRevB.83.140512	journal	April 2011
Nodeless superconductivity of single-crystalline K x Fe 2 − y Se 2 revealed by the low-temperature specific heat Zeng, B.; Shen, B.; Chen, G. F. Physical Review B, Vol. 83, Issue 14 https://doi.org/10.1103/PhysRevB.83.144511	journal	April 2011
First-principles calculation of transition-metal impurities in LaFeAsO Nakamura, Kazuma; Arita, Ryotaro; Ikeda, Hiroaki Physical Review B, Vol. 83, Issue 14 https://doi.org/10.1103/PhysRevB.83.144512	journal	April 2011
Anisotropic quasiparticle lifetimes in Fe-based superconductors Kemper, A. F.; Korshunov, M. M.; Devereaux, T. P. Physical Review B, Vol. 83, Issue 18 https://doi.org/10.1103/PhysRevB.83.184516	journal	May 2011
Crossover from weak to strong pairing in unconventional superconductors Inosov, D. S.; Park, J. T.; Charnukha, A. Physical Review B, Vol. 83, Issue 21 https://doi.org/10.1103/PhysRevB.83.214520	journal	June 2011
Infrared spectrum and its implications for the electronic structure of the semiconducting iron selenide K 0 . 83 Fe 1 . 53 Se 2 Chen, Z. G.; Yuan, R. H.; Dong, T. Physical Review B, Vol. 83, Issue 22 https://doi.org/10.1103/PhysRevB.83.220507	journal	June 2011
Antiferromagnetic spin fluctuations in LiFeAs observed by neutron scattering Taylor, A. E.; Pitcher, M. J.; Ewings, R. A. Physical Review B, Vol. 83, Issue 22 https://doi.org/10.1103/PhysRevB.83.220514	journal	June 2011
Determination of the pairing state in iron-based superconductors through neutron scattering Nagai, Yuki; Kuroki, Kazuhiko Physical Review B, Vol. 83, Issue 22 https://doi.org/10.1103/PhysRevB.83.220516	journal	June 2011
Stripes, spin resonance, and nodeless d -wave pairing symmetry in Fe 2 Se 2 -based layered superconductors Das, Tanmoy; Balatsky, A. V. Physical Review B, Vol. 84, Issue 1 https://doi.org/10.1103/PhysRevB.84.014521	journal	July 2011
Transport properties of three-dimensional extended s -wave states in Fe-based superconductors Mishra, V.; Graser, S.; Hirschfeld, P. J. Physical Review B, Vol. 84, Issue 1 https://doi.org/10.1103/PhysRevB.84.014524	journal	July 2011
Gap in KFe 2 As 2 studied by small-angle neutron scattering observations of the magnetic vortex lattice Kawano-Furukawa, H.; Bowell, C. J.; White, J. S. Physical Review B, Vol. 84, Issue 2 https://doi.org/10.1103/PhysRevB.84.024507	journal	July 2011
Nodal gap structure of superconducting BaFe 2 (As 1 − x P x ) 2 from angle-resolved thermal conductivity in a magnetic field Yamashita, M.; Senshu, Y.; Shibauchi, T. Physical Review B, Vol. 84, Issue 6 https://doi.org/10.1103/PhysRevB.84.060507	journal	August 2011
Spin Resonance in the d -Wave Superconductor CeCoIn 5 Stock, C.; Broholm, C.; Hudis, J. Physical Review Letters, Vol. 100, Issue 8 https://doi.org/10.1103/PhysRevLett.100.087001	journal	February 2008
Density Functional Study of LaFeAsO 1 − x F x : A Low Carrier Density Superconductor Near Itinerant Magnetism Singh, D. J.; Du, M. -H. Physical Review Letters, Vol. 100, Issue 23 https://doi.org/10.1103/PhysRevLett.100.237003	journal	June 2008
As 75 NMR Studies of Superconducting LaFeAs O 0.9 F 0.1 Grafe, H. -J.; Paar, D.; Lang, G. Physical Review Letters, Vol. 101, Issue 4 https://doi.org/10.1103/PhysRevLett.101.047003	journal	July 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
Strong Correlations and Magnetic Frustration in the High T c Iron Pnictides Si, Qimiao; Abrahams, Elihu Physical Review Letters, Vol. 101, Issue 7 https://doi.org/10.1103/PhysRevLett.101.076401	journal	August 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
Momentum Dependence of the Superconducting Gap in NdFeAsO 0.9 F 0.1 Single Crystals Measured by Angle Resolved Photoemission Spectroscopy Kondo, Takeshi; Santander-Syro, A. F.; Copie, O. Physical Review Letters, Vol. 101, Issue 14 https://doi.org/10.1103/PhysRevLett.101.147003	journal	October 2008
Pairing Symmetry in a Two-Orbital Exchange Coupling Model of Oxypnictides Seo, Kangjun; Bernevig, B. Andrei; Hu, Jiangping Physical Review Letters, Vol. 101, Issue 20 https://doi.org/10.1103/PhysRevLett.101.206404	journal	November 2008
Model for the Magnetic Order and Pairing Channels in Fe Pnictide Superconductors Daghofer, M.; Moreo, A.; Riera, J. A. Physical Review Letters, Vol. 101, Issue 23 https://doi.org/10.1103/PhysRevLett.101.237004	journal	December 2008
Microwave Penetration Depth and Quasiparticle Conductivity of PrFeAsO 1 − y Single Crystals: Evidence for a Full-Gap Superconductor Hashimoto, K.; Shibauchi, T.; Kato, T. Physical Review Letters, Vol. 102, Issue 1 https://doi.org/10.1103/PhysRevLett.102.017002	journal	January 2009
Functional Renormalization-Group Study of the Pairing Symmetry and Pairing Mechanism of the FeAs-Based High-Temperature Superconductor Wang, Fa; Zhai, Hui; Ran, Ying Physical Review Letters, Vol. 102, Issue 4 https://doi.org/10.1103/PhysRevLett.102.047005	journal	January 2009
Two-dimensional resonant magnetic excitation in BaFe 1.84 Co 0.16 As 2 Lumsden, M. D.; Christianson, A. D.; Parshall, D. Physical Review Letters, Vol. 102, Issue 10 https://doi.org/10.1103/PhysRevLett.102.107005	journal	March 2009
Evidence for a Nodal-Line Superconducting State in LaFePO Fletcher, J. D.; Serafin, A.; Malone, L. Physical Review Letters, Vol. 102, Issue 14 https://doi.org/10.1103/PhysRevLett.102.147001	journal	April 2009
Observation of the Josephson Effect in Pb / Ba 1 − x K x Fe 2 As 2 Single Crystal Junctions Zhang, Xiaohang; Oh, Yoon Seok; Liu, Yong Physical Review Letters, Vol. 102, Issue 14 https://doi.org/10.1103/PhysRevLett.102.147002	journal	April 2009
Microwave Surface-Impedance Measurements of the Magnetic Penetration Depth in Single Crystal Ba 1 − x K x Fe 2 As 2 Superconductors: Evidence for a Disorder-Dependent Superfluid Density Hashimoto, K.; Shibauchi, T.; Kasahara, S. Physical Review Letters, Vol. 102, Issue 20 https://doi.org/10.1103/PhysRevLett.102.207001	journal	May 2009
Possible Phase-Sensitive Tests of Pairing Symmetry in Pnictide Superconductors Parker, D.; Mazin, I. I. Physical Review Letters, Vol. 102, Issue 22 https://doi.org/10.1103/PhysRevLett.102.227007	journal	June 2009
Nonexponential London Penetration Depth of FeAs-Based Superconducting R FeAsO 0.9 F 0.1 ( R = La , Nd) Single Crystals Martin, C.; Tillman, M. E.; Kim, H. Physical Review Letters, Vol. 102, Issue 24 https://doi.org/10.1103/PhysRevLett.102.247002	journal	June 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
Spin Gap and Resonance at the Nesting Wave Vector in Superconducting FeSe 0.4 Te 0.6 Qiu, Yiming; Bao, Wei; Zhao, Y. Physical Review Letters, Vol. 103, Issue 6 https://doi.org/10.1103/PhysRevLett.103.067008	journal	August 2009
Static and Dynamic Magnetism in Underdoped Superconductor BaFe 1.92 Co 0.08 As 2 Christianson, A. D.; Lumsden, M. D.; Nagler, S. E. Physical Review Letters, Vol. 103, Issue 8 https://doi.org/10.1103/PhysRevLett.103.087002	journal	August 2009
Evidence for a Nodal Energy Gap in the Iron-Pnictide Superconductor LaFePO from Penetration Depth Measurements by Scanning SQUID Susceptometry Hicks, Clifford W.; Lippman, Thomas M.; Huber, Martin E. Physical Review Letters, Vol. 103, Issue 12 https://doi.org/10.1103/PhysRevLett.103.127003	journal	September 2009
Violation of Anderson’s Theorem for the Sign-Reversing s -Wave State of Iron-Pnictide Superconductors Onari, Seiichiro; Kontani, Hiroshi Physical Review Letters, Vol. 103, Issue 17 https://doi.org/10.1103/PhysRevLett.103.177001	journal	October 2009
Nonmagnetic Impurity Resonances as a Signature of Sign-Reversal Pairing in FeAs-Based Superconductors Zhang, Degang Physical Review Letters, Vol. 103, Issue 18 https://doi.org/10.1103/PhysRevLett.103.186402	journal	October 2009
Ferro-Orbital Order and Strong Magnetic Anisotropy in the Parent Compounds of Iron-Pnictide Superconductors Lee, Chi-Cheng; Yin, Wei-Guo; Ku, Wei Physical Review Letters, Vol. 103, Issue 26 https://doi.org/10.1103/PhysRevLett.103.267001	journal	December 2009
Evolution of the Fermi Surface of BaFe 2 ( As 1 − x P x ) 2 on Entering the Superconducting Dome Shishido, H.; Bangura, A. F.; Coldea, A. I. Physical Review Letters, Vol. 104, Issue 5 https://doi.org/10.1103/PhysRevLett.104.057008	journal	February 2010
Doping Dependence of Heat Transport in the Iron-Arsenide Superconductor Ba ( Fe 1 − x Co x ) 2 As 2 : From Isotropic to a Strongly k -Dependent Gap Structure Tanatar, M. A.; Reid, J. -Ph.; Shakeripour, H. Physical Review Letters, Vol. 104, Issue 6 https://doi.org/10.1103/PhysRevLett.104.067002	journal	February 2010
Suppression of the Critical Temperature of Superconducting NdFeAs(OF) Single Crystals by Kondo-Like Defect Sites Induced by α -Particle Irradiation Tarantini, C.; Putti, M.; Gurevich, A. Physical Review Letters, Vol. 104, Issue 8 https://doi.org/10.1103/PhysRevLett.104.087002	journal	February 2010
Quantum Criticality and Nodal Superconductivity in the FeAs-Based Superconductor KFe 2 As 2 Dong, J. K.; Zhou, S. Y.; Guan, T. Y. Physical Review Letters, Vol. 104, Issue 8 https://doi.org/10.1103/PhysRevLett.104.087005	journal	February 2010
Orbital-Fluctuation-Mediated Superconductivity in Iron Pnictides: Analysis of the Five-Orbital Hubbard-Holstein Model Kontani, Hiroshi; Onari, Seiichiro Physical Review Letters, Vol. 104, Issue 15 https://doi.org/10.1103/PhysRevLett.104.157001	journal	April 2010
Volovik Effect in the ± s -Wave State for the Iron-Based Superconductors Bang, Yunkyu Physical Review Letters, Vol. 104, Issue 21 https://doi.org/10.1103/PhysRevLett.104.217001	journal	May 2010
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Single-Impurity Problem in Iron-Pnictide Superconductors Kariyado, Toshikaze; Ogata, Masao Journal of the Physical Society of Japan, Vol. 79, Issue 8 https://doi.org/10.1143/JPSJ.79.083704	journal	August 2010
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Observation of Fermi-surface–dependent nodeless superconducting gaps in Ba _0.6 K _0.4 Fe ₂ As ₂ Ding, H.; Richard, P.; Nakayama, K. EPL (Europhysics Letters), Vol. 83, Issue 4 https://doi.org/10.1209/0295-5075/83/47001	journal	July 2008
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Antiferromagnetic correlation and the pairing mechanism of the cuprates and iron pnictides: A view from the functional renormalization group studies Wang, Fa; Zhai, Hui; Lee, Dung-Hai EPL (Europhysics Letters), Vol. 85, Issue 3 https://doi.org/10.1209/0295-5075/85/37005	journal	February 2009
Superconducting gap symmetry of Ba _0.6 K _0.4 Fe ₂ As ₂ studied by angle-resolved photoemission spectroscopy Nakayama, K.; Sato, T.; Richard, P. EPL (Europhysics Letters), Vol. 85, Issue 6 https://doi.org/10.1209/0295-5075/85/67002	journal	March 2009
Heavy-anion solvation of polarity fluctuations in pnictides Sawatzky, G. A.; Elfimov, I. S.; van den Brink, J. EPL (Europhysics Letters), Vol. 86, Issue 1 https://doi.org/10.1209/0295-5075/86/17006	journal	April 2009
Anisotropic spin fluctuations and multiple superconducting gaps in hole-doped Ba _0.72 K _0.28 Fe ₂ As ₂ : NMR in a single crystal Matano, K.; Li, Z.; Sun, G. L. EPL (Europhysics Letters), Vol. 87, Issue 2 https://doi.org/10.1209/0295-5075/87/27012	journal	July 2009
Magnetic impurities in the two-band s_±-wave superconductors Li, Jian; Wang, Yupeng EPL (Europhysics Letters), Vol. 88, Issue 1 https://doi.org/10.1209/0295-5075/88/17009	journal	October 2009
Superconductivity in multi-orbital t-J ₁ -J ₂ model and its implications for iron pnictides Goswami, Pallab; Nikolic, Predrag; Si, Qimiao EPL (Europhysics Letters), Vol. 91, Issue 3 https://doi.org/10.1209/0295-5075/91/37006	journal	August 2010
The electron pairing of K _x Fe _{2− y} Se ₂ Wang, Fa; Yang, Fan; Gao, Miao EPL (Europhysics Letters), Vol. 93, Issue 5 https://doi.org/10.1209/0295-5075/93/57003	journal	February 2011

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