Magnetism and superconductivity in Fe1+yTe1-xSex

Tranquada, John M.; Xu, Guangyong; Zaliznyak, Igor A.

doi:10.1088/1361-648X/ab3b3b

Title: Magnetism and superconductivity in Fe_1+yTe_1-xSe_x

Abstract

Neutron scattering has played a significant role in characterizing magnetic and structural correlations in Fe$$_{1+y}$$Te$$_{1-x}$$Se$$_x$$ and their connections with superconductivity. Here we review several key aspects of the physics of iron chalcogenide superconductors where neutron studies played a key role. These topics include the phase diagram of Fe$$_{1+y}$$Te$$_{1-x}$$Se$$_{x}$$, where the doping-dependence of structural transitions can be understood from a mapping to the anisotropic random field Ising model. We then discuss orbital-selective Mott physics in the Fe chalcogenide series, where temperature-dependent magnetism in the parent material provided one of the earliest cases for orbital-selective correlation effects in a Hund's metal. Finally, we elaborate on the character of local magnetic correlations revealed by neutron scattering, its dependence on temperature and composition, and the connections to nematicity and superconductivity.

Authors:

^[1]; Xu, Guangyong ^[2]; Zaliznyak, Igor A. ^[1]

Brookhaven National Lab. (BNL), Upton, NY (United States)
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States)

Publication Date:: Wed Aug 14 00:00:00 EDT 2019

Research Org.:: Brookhaven National Lab. (BNL), Upton, NY (United States)

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

OSTI Identifier:: 1558251

Report Number(s):: BNL-212008-2019-JAAM
Journal ID: ISSN 0953-8984

Grant/Contract Number:: SC0012704

Resource Type:: Accepted Manuscript

Journal Name:: Journal of Physics. Condensed Matter

Additional Journal Information:: Journal Volume: 32; Journal Issue: 37; Journal ID: ISSN 0953-8984

Publisher:: IOP Publishing

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Tranquada, John M., Xu, Guangyong, and Zaliznyak, Igor A. Magnetism and superconductivity in Fe1+yTe1-xSex.  United States: N. p., 2019. 
Web.  doi:10.1088/1361-648X/ab3b3b.

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                    Tranquada, John M., Xu, Guangyong, & Zaliznyak, Igor A. Magnetism and superconductivity in Fe1+yTe1-xSex.  United States.  https://doi.org/10.1088/1361-648X/ab3b3b

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                    Tranquada, John M., Xu, Guangyong, and Zaliznyak, Igor A. Wed .  
"Magnetism and superconductivity in Fe1+yTe1-xSex".  United States.  https://doi.org/10.1088/1361-648X/ab3b3b.  https://www.osti.gov/servlets/purl/1558251.

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@article{osti_1558251,

  title        = {Magnetism and superconductivity in Fe1+yTe1-xSex},

  author       = {Tranquada, John M. and Xu, Guangyong and Zaliznyak, Igor A.},

  abstractNote = {Neutron scattering has played a significant role in characterizing magnetic and structural correlations in Fe$_{1+y}$Te$_{1-x}$Se$_x$ and their connections with superconductivity. Here we review several key aspects of the physics of iron chalcogenide superconductors where neutron studies played a key role. These topics include the phase diagram of Fe$_{1+y}$Te$_{1-x}$Se$_{x}$, where the doping-dependence of structural transitions can be understood from a mapping to the anisotropic random field Ising model. We then discuss orbital-selective Mott physics in the Fe chalcogenide series, where temperature-dependent magnetism in the parent material provided one of the earliest cases for orbital-selective correlation effects in a Hund's metal. Finally, we elaborate on the character of local magnetic correlations revealed by neutron scattering, its dependence on temperature and composition, and the connections to nematicity and superconductivity.},

  doi          = {10.1088/1361-648X/ab3b3b},

  journal      = {Journal of Physics. Condensed Matter},

  number       = 37,

  volume       = 32,

  place        = {United States},

  year         = {Wed Aug 14 00:00:00 EDT 2019},

  month        = {Wed Aug 14 00:00:00 EDT 2019}

}

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Parshall, D.; Chen, G.; Pintschovius, L.
Physical Review B, Vol. 85, Issue 14
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Electronic properties of single-crystalline ${Fe}_{1.05} Te$ and ${Fe}_{1.03} {Se}_{0.30} {Te}_{0.70}$
journal, April 2009

Chen, G. F.; Chen, Z. G.; Dong, J.
Physical Review B, Vol. 79, Issue 14
DOI: 10.1103/PhysRevB.79.140509

Evolution of spin excitations into the superconducting state in FeTe1−xSex
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Lumsden, M. D.; Christianson, A. D.; Goremychkin, E. A.
Nature Physics, Vol. 6, Issue 3
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${FeTe}_{0.55} {Se}_{0.45}$ : A multiband superconductor in the clean and dirty limit
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Homes, C. C.; Dai, Y. M.; Wen, J. S.
Physical Review B, Vol. 91, Issue 14
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Quenched disorder and vestigial nematicity in the pseudogap regime of the cuprates
journal, May 2014

Nie, L.; Tarjus, G.; Kivelson, S. A.
Proceedings of the National Academy of Sciences, Vol. 111, Issue 22
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Strong interplay between stripe spin fluctuations, nematicity and superconductivity in FeSe
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Wang, Qisi; Shen, Yao; Pan, Bingying
Nature Materials, Vol. 15, Issue 2
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Orbital superconductivity, defects, and pinned nematic fluctuations in the doped iron chalcogenide ${FeSe}_{0.45} {Te}_{0.55}$
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Sarkar, Saheli; Van Dyke, John; Sprau, Peter O.
Physical Review B, Vol. 96, Issue 6
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Unconventional s-Wave Superconductivity in Fe(Se,Te)
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Hanaguri, T.; Niitaka, S.; Kuroki, K.
Science, Vol. 328, Issue 5977
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FeAs-Based Superconductivity: A Case Study of the Effects of Transition Metal Doping on BaFe ₂ As ₂
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Canfield, Paul C.; Bud'ko, Sergey L.
Annual Review of Condensed Matter Physics, Vol. 1, Issue 1
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Spin fluctuations and superconductivity in powders of Fe $_{1 + x}$ Te $_{0.7}$ Se $_{0.3}$ as a function of interstitial iron concentration
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Stock, C.; Rodriguez, E. E.; Green, M. A.
Physical Review B, Vol. 85, Issue 9
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Isotropic superconducting gaps with enhanced pairing on electron Fermi surfaces in FeTe $_{0.55}$ Se $_{0.45}$
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Miao, H.; Richard, P.; Tanaka, Y.
Physical Review B, Vol. 85, Issue 9
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Effect of magnetic field on the spin resonance in ${FeTe}_{0.5} {Se}_{0.5}$ as seen via inelastic neutron scattering
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Wen, Jinsheng; Xu, Guangyong; Xu, Zhijun
Physical Review B, Vol. 81, Issue 10
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Effects of Ni and Co doping on the physical properties of tetragonal FeSe0.5Te0.5 superconductor
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Shipra, R.; Takeya, H.; Hirata, K.
Physica C: Superconductivity, Vol. 470, Issue 13-14
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Tetragonal-to-Orthorhombic Structural Phase Transition at 90 K in the Superconductor ${Fe}_{1.01} Se$
journal, July 2009

McQueen, T. M.; Williams, A. J.; Stephens, P. W.
Physical Review Letters, Vol. 103, Issue 5
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High-temperature superconductivity in iron pnictides and chalcogenides
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Si, Qimiao; Yu, Rong; Abrahams, Elihu
Nature Reviews Materials, Vol. 1, Issue 4
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Ferro-Orbital Ordering Transition in Iron Telluride ${Fe}_{1 + y} Te$
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Fobes, David; Zaliznyak, Igor A.; Xu, Zhijun
Physical Review Letters, Vol. 112, Issue 18
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Evolution of two-step structural phase transition in Fe1+dTe detected by low-temperature x-ray diffraction
journal, June 2012

Mizuguchi, Yoshikazu; Hamada, Kentaro; Goto, Kazuki
Solid State Communications, Vol. 152, Issue 12
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Neutron scattering resonance and the iron-pnictide superconducting gap
journal, April 2009

Maier, T. A.; Graser, S.; Scalapino, D. J.
Physical Review B, Vol. 79, Issue 13
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Surprising loss of three-dimensionality in low-energy spin correlations on approaching superconductivity in ${Fe}_{1 + y} {Te}_{1 - x} {Se}_{x}$
journal, October 2017

Xu, Zhijun; Schneeloch, J. A.; Wen, Jinsheng
Physical Review B, Vol. 96, Issue 13
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Unified Picture for Magnetic Correlations in Iron-Based Superconductors
journal, September 2010

Yin, Wei-Guo; Lee, Chi-Cheng; Ku, Wei
Physical Review Letters, Vol. 105, Issue 10
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Unconventional Temperature Enhanced Magnetism in ${Fe}_{1.1} Te$
journal, November 2011

Zaliznyak, Igor A.; Xu, Zhijun; Tranquada, John M.
Physical Review Letters, Vol. 107, Issue 21
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Title: Magnetism and superconductivity in Fe1+yTe1-xSex

Abstract

Citation Formats

First-Principles Calculations of the Electronic Structure of Tetragonal α -FeTe and α -FeSe Crystals: Evidence for a Bicollinear Antiferromagnetic Order journal, April 2009

Experimental observation of incoherent-coherent crossover and orbital-dependent band renormalization in iron chalcogenide superconductors journal, December 2015

Neutron-Diffraction Measurements of Magnetic Order and a Structural Transition in the Parent BaFe 2 As 2 Compound of FeAs-Based High-Temperature Superconductors journal, December 2008

Observation of universal strong orbital-dependent correlation effects in iron chalcogenides journal, July 2015

Enhanced low-energy magnetic excitations via suppression of the itinerancy in Fe 0.98 − z Cu z Te 0.5 Se 0.5 journal, October 2013

Density functional study of FeS, FeSe, and FeTe: Electronic structure, magnetism, phonons, and superconductivity journal, October 2008

The Key Ingredients of the Electronic Structure of FeSe journal, March 2018

The phase diagrams of iron-based superconductors: Theory and experiments journal, January 2016

Measurement of Coherent Polarons in the Strongly Coupled Antiferromagnetically Ordered Iron-Chalcogenide Fe 1.02 Te using Angle-Resolved Photoemission Spectroscopy journal, January 2013

Magnetic order close to superconductivity in the iron-based layered LaO1-xF x FeAs systems journal, May 2008

Magnetic excitations of Fe 1 + y Se x Te 1 − x in magnetic and superconductive phases journal, March 2010

Multiband magnetism and superconductivity in Fe-based compounds journal, February 2009

Multiple topological states in iron-based superconductors journal, September 2018

Local atomic structure of superconducting FeSe 1 − x Te x journal, April 2010

Thermal evolution of antiferromagnetic correlations and tetrahedral bond angles in superconducting FeTe 1 − x Se x journal, March 2016

Spin Waves in the ( π , 0 ) Magnetically Ordered Iron Chalcogenide Fe 1.05 Te journal, February 2011

Local-moment magnetism in superconducting FeTe 0.35 Se 0.65 as seen via inelastic neutron scattering journal, August 2011

Two-component Coulomb glass in insulators with a local attraction journal, May 2012

Magnetic ground state of FeSe journal, July 2016

Evidence for weak electronic correlations in iron pnictides journal, July 2009

Magnetic, transport, and optical properties of monolayer copper oxides journal, July 1998

Normal-State Hourglass Dispersion of the Spin Excitations in FeSe x Te 1 − x journal, October 2010

Magnetic neutron scattering studies on the Fe-based superconductor system Fe1+yTe1−xSex journal, July 2015

Antiferromagnetic order and spin dynamics in iron-based superconductors journal, August 2015

Extreme sensitivity of superconductivity to stoichiometry in Fe 1 + δ Se journal, January 2009

Spin-liquid polymorphism in a correlated electron system on the threshold of superconductivity journal, August 2015

Superconductivity gets an iron boost journal, March 2010

Superconductivity in the PbO-type structure -FeSe journal, September 2008

Superconductivity, magnetism, and stoichiometry of single crystals of Fe 1 + y ( Te 1 − x S x ) z journal, December 2009

Momentum dependence and nodes of the superconducting gap in the iron pnictides journal, October 2009

Investigation of the Spin-Glass Regime between the Antiferromagnetic and Superconducting Phases in Fe 1+ y Se x Te 1- x journal, November 2010

Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides journal, September 2011

Doping Driven ( π , 0) Nesting and Magnetic Properties of Fe 1 + x Te Superconductors journal, August 2009

On the multi-orbital band structure and itinerant magnetism of iron-based superconductors journal, January 2011

Electrical resistivity across a nematic quantum critical point journal, February 2019

Strong Correlations from Hund’s Coupling journal, April 2013

Temperature-Dependent Transformation of the Magnetic Excitation Spectrum on Approaching Superconductivity in Fe 1 + y − x ( Ni / Cu ) x Te 0.5 Se 0.5 journal, November 2012

What drives nematic order in iron-based superconductors? journal, January 2014

The Electron-Pairing Mechanism of Iron-Based Superconductors journal, April 2011

First-order magnetic and structural phase transitions in Fe 1 + y Se x Te 1 − x journal, February 2009

Strong coupling to magnetic fluctuations in the charge dynamics of iron-based superconductors journal, July 2010

X-ray diffuse scattering study of local distortions in Fe 1 + x Te induced by excess Fe journal, May 2011

Dimensional Crossover and Charge Order in Half-Doped Manganites and Cobaltites journal, July 2003

Two kinds of in-plane resistivity anisotropy in Fe 1 + δ Te ( δ = 0.09 ) as seen via synchrotron radiation x-ray diffraction and in situ resistivity measurements journal, May 2015

Spin Gap and Resonance at the Nesting Wave Vector in Superconducting FeSe 0.4 Te 0.6 journal, August 2009

Suppression of phase separation and giant enhancement of superconducting transition temperature in FeSe 1− x Te x thin films journal, February 2015

A common thread: The pairing interaction for unconventional superconductors journal, October 2012

From (π,0) magnetic order to superconductivity with (π,π) magnetic resonance in Fe1.02Te1−xSex journal, July 2010

Impact of dynamic orbital correlations on magnetic excitations in the normal state of iron-based superconductors journal, September 2012

The metal–insulator transition in Fe 1.01− x Cu x Se journal, July 2009

Unconventional electronic reconstruction in undoped ( Ba , Sr ) Fe 2 As 2 across the spin density wave transition journal, November 2009

Modified magnetism within the coherence volume of superconducting Fe 1 + δ Se x Te 1 − x journal, September 2014

Substitution of Ni for Fe in superconducting Fe 0.98 Te 0.5 Se 0.5 depresses the normal-state conductivity but not the magnetic spectral weight journal, January 2015

Disappearance of static magnetic order and evolution of spin fluctuations in Fe 1 + δ Se x Te 1 − x journal, September 2010

Strong correlations and spin-density-wave phase induced by a massive spectral weight redistribution in α -Fe 1.06 Te journal, October 2010

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Spin dynamics and orbital-antiphase pairing symmetry in iron-based superconductors journal, October 2014

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Low-temperature phase diagram of Fe 1 + y Te studied using x-ray diffraction journal, September 2013

Incommensurate itinerant antiferromagnetic excitations and spin resonance in the FeTe 0.6 Se 0.4 superconductor journal, June 2010

Phase diagram and gap anisotropy in iron-pnictide superconductors journal, February 2010

Tellurium substitution effect on superconductivity of the α-phase iron selenide journal, October 2008

Spin anisotropy of the resonance peak in superconducting FeSe 0.5 Te 0.5 journal, May 2011

Unusual Relationship between Magnetism and Superconductivity in FeTe 0.5 Se 0.5 journal, May 2010

Inelastic Neutron Scattering Study of a Nonmagnetic Collapsed Tetragonal Phase in Nonsuperconducting CaFe 2 As 2 : Evidence of the Impact of Spin Fluctuations on Superconductivity in the Iron-Arsenide Compounds journal, November 2013

Magnetism in Parent Iron Chalcogenides: Quantum Fluctuations Select Plaquette Order journal, October 2012

Theory of the evolution of magnetic order in Fe 1 + y Te compounds with increasing interstitial iron journal, October 2014

Spatial complexity due to bulk electronic nematicity in a superconducting underdoped cuprate journal, January 2012

Coherence–incoherence crossover in the normal state of iron oxypnictides and importance of Hund's rule coupling journal, February 2009

The energy gap of the compound FeSe0.5Te0.5 determined by specific heat and Point Contact Spectroscopy journal, October 2015

Ubiquitous signatures of nematic quantum criticality in optimally doped Fe-based superconductors journal, May 2016

Tunable ( δ π , δ π )-Type Antiferromagnetic Order in α -Fe(Te,Se) Superconductors journal, June 2009

Nanoscale chemical phase separation in FeTe 0.55 Se 0.45 as seen via scanning tunneling spectroscopy journal, June 2011

Structural instabilities in lanthanum cuprate superconductors journal, April 1994

Coupling of spin and orbital excitations in the iron-based superconductor FeSe 0.5 Te 0.5 journal, June 2010

Title: Magnetism and superconductivity in Fe_1+yTe_1-xSe_x

First-Principles Calculations of the Electronic Structure of Tetragonal $α$ -FeTe and $α$ -FeSe Crystals: Evidence for a Bicollinear Antiferromagnetic Order
journal, April 2009

Experimental observation of incoherent-coherent crossover and orbital-dependent band renormalization in iron chalcogenide superconductors
journal, December 2015

Neutron-Diffraction Measurements of Magnetic Order and a Structural Transition in the Parent ${BaFe}_{2} {As}_{2}$ Compound of FeAs-Based High-Temperature Superconductors
journal, December 2008

Observation of universal strong orbital-dependent correlation effects in iron chalcogenides
journal, July 2015

Enhanced low-energy magnetic excitations via suppression of the itinerancy in Fe $_{0.98 - z}$ Cu $_{z}$ Te $_{0.5}$ Se $_{0.5}$
journal, October 2013

Density functional study of FeS, FeSe, and FeTe: Electronic structure, magnetism, phonons, and superconductivity
journal, October 2008

The Key Ingredients of the Electronic Structure of FeSe
journal, March 2018

The phase diagrams of iron-based superconductors: Theory and experiments
journal, January 2016

Measurement of Coherent Polarons in the Strongly Coupled Antiferromagnetically Ordered Iron-Chalcogenide ${Fe}_{1.02} Te$ using Angle-Resolved Photoemission Spectroscopy
journal, January 2013

Magnetic order close to superconductivity in the iron-based layered LaO1-xF x FeAs systems
journal, May 2008

Magnetic excitations of Fe _{1 + y} Se _x Te _{1 − x} in magnetic and superconductive phases
journal, March 2010

Multiband magnetism and superconductivity in Fe-based compounds
journal, February 2009

Multiple topological states in iron-based superconductors
journal, September 2018

Local atomic structure of superconducting ${FeSe}_{1 - x} {Te}_{x}$
journal, April 2010

Thermal evolution of antiferromagnetic correlations and tetrahedral bond angles in superconducting ${FeTe}_{1 - x} {Se}_{x}$
journal, March 2016

Spin Waves in the $(π, 0)$ Magnetically Ordered Iron Chalcogenide ${Fe}_{1.05} Te$
journal, February 2011

Local-moment magnetism in superconducting FeTe $_{0.35}$ Se $_{0.65}$ as seen via inelastic neutron scattering
journal, August 2011

Two-component Coulomb glass in insulators with a local attraction
journal, May 2012

Magnetic ground state of FeSe
journal, July 2016

Evidence for weak electronic correlations in iron pnictides
journal, July 2009

Magnetic, transport, and optical properties of monolayer copper oxides
journal, July 1998

Normal-State Hourglass Dispersion of the Spin Excitations in ${FeSe}_{x} {Te}_{1 - x}$
journal, October 2010

Magnetic neutron scattering studies on the Fe-based superconductor system Fe1+yTe1−xSex
journal, July 2015

Antiferromagnetic order and spin dynamics in iron-based superconductors
journal, August 2015

Extreme sensitivity of superconductivity to stoichiometry in ${Fe}_{1 + δ} Se$
journal, January 2009

Spin-liquid polymorphism in a correlated electron system on the threshold of superconductivity
journal, August 2015

Superconductivity gets an iron boost
journal, March 2010

Superconductivity in the PbO-type structure -FeSe
journal, September 2008

Superconductivity, magnetism, and stoichiometry of single crystals of ${Fe}_{1 + y} {({Te}_{1 - x} S_{x})}_{z}$
journal, December 2009

Momentum dependence and nodes of the superconducting gap in the iron pnictides
journal, October 2009

Investigation of the Spin-Glass Regime between the Antiferromagnetic and Superconducting Phases in Fe _{1+ y} Se _x Te _{1- x}
journal, November 2010

Kinetic frustration and the nature of the magnetic and paramagnetic states in iron pnictides and iron chalcogenides
journal, September 2011

Doping Driven ( $π$ , 0) Nesting and Magnetic Properties of ${Fe}_{1 + x} Te$ Superconductors
journal, August 2009

On the multi-orbital band structure and itinerant magnetism of iron-based superconductors
journal, January 2011

Electrical resistivity across a nematic quantum critical point
journal, February 2019

Strong Correlations from Hund’s Coupling
journal, April 2013

Temperature-Dependent Transformation of the Magnetic Excitation Spectrum on Approaching Superconductivity in ${Fe}_{1 + y - x} (Ni / Cu)_{x} {Te}_{0.5} {Se}_{0.5}$
journal, November 2012

What drives nematic order in iron-based superconductors?
journal, January 2014

The Electron-Pairing Mechanism of Iron-Based Superconductors
journal, April 2011

First-order magnetic and structural phase transitions in ${Fe}_{1 + y} {Se}_{x} {Te}_{1 - x}$
journal, February 2009

Strong coupling to magnetic fluctuations in the charge dynamics of iron-based superconductors
journal, July 2010

X-ray diffuse scattering study of local distortions in Fe $_{1 + x}$ Te induced by excess Fe
journal, May 2011

Dimensional Crossover and Charge Order in Half-Doped Manganites and Cobaltites
journal, July 2003

Two kinds of in-plane resistivity anisotropy in ${Fe}_{1 + δ} Te (δ = 0.09)$ as seen via synchrotron radiation x-ray diffraction and in situ resistivity measurements
journal, May 2015

Spin Gap and Resonance at the Nesting Wave Vector in Superconducting ${FeSe}_{0.4} {Te}_{0.6}$
journal, August 2009

Suppression of phase separation and giant enhancement of superconducting transition temperature in FeSe _{1− x} Te _x thin films
journal, February 2015

A common thread: The pairing interaction for unconventional superconductors
journal, October 2012

From (π,0) magnetic order to superconductivity with (π,π) magnetic resonance in Fe1.02Te1−xSex
journal, July 2010

Impact of dynamic orbital correlations on magnetic excitations in the normal state of iron-based superconductors
journal, September 2012

The metal–insulator transition in Fe _{1.01− x} Cu _x Se
journal, July 2009

Unconventional electronic reconstruction in undoped $(Ba, Sr) {Fe}_{2} {As}_{2}$ across the spin density wave transition
journal, November 2009

Modified magnetism within the coherence volume of superconducting ${Fe}_{1 + δ} {Se}_{x} {Te}_{1 - x}$
journal, September 2014

Substitution of Ni for Fe in superconducting ${Fe}_{0.98} {Te}_{0.5} {Se}_{0.5}$ depresses the normal-state conductivity but not the magnetic spectral weight
journal, January 2015

Disappearance of static magnetic order and evolution of spin fluctuations in ${Fe}_{1 + δ} {Se}_{x} {Te}_{1 - x}$
journal, September 2010

Strong correlations and spin-density-wave phase induced by a massive spectral weight redistribution in $α {-Fe}_{1.06} Te$
journal, October 2010

Coexistence of superconductivity and short-range double-stripe spin correlations in Te-vapor annealed ${FeTe}_{1 - x} {Se}_{x}$ ( $x \leq 0.2$ )
journal, June 2018

Charge and Magnetic Order in L $a_{0.5}$ S $r_{1.5}$ Mn $O_{4}$
journal, March 1996

Using disorder to detect locally ordered electron nematics via hysteresis
journal, July 2011

Spin dynamics and orbital-antiphase pairing symmetry in iron-based superconductors
journal, October 2014

Magnetic order tuned by Cu substitution in Fe $_{1.1 - z}$ Cu $_{z}$ Te
journal, July 2012

Low-temperature phase diagram of Fe $_{1 + y}$ Te studied using x-ray diffraction
journal, September 2013

Incommensurate itinerant antiferromagnetic excitations and spin resonance in the ${FeTe}_{0.6} {Se}_{0.4}$ superconductor
journal, June 2010

Phase diagram and gap anisotropy in iron-pnictide superconductors
journal, February 2010

Tellurium substitution effect on superconductivity of the α-phase iron selenide
journal, October 2008

Spin anisotropy of the resonance peak in superconducting FeSe $_{0.5}$ Te $_{0.5}$
journal, May 2011

Unusual Relationship between Magnetism and Superconductivity in ${FeTe}_{0.5} {Se}_{0.5}$
journal, May 2010

Inelastic Neutron Scattering Study of a Nonmagnetic Collapsed Tetragonal Phase in Nonsuperconducting ${CaFe}_{2} {As}_{2}$ : Evidence of the Impact of Spin Fluctuations on Superconductivity in the Iron-Arsenide Compounds
journal, November 2013

Magnetism in Parent Iron Chalcogenides: Quantum Fluctuations Select Plaquette Order
journal, October 2012

Theory of the evolution of magnetic order in ${Fe}_{1 + y} Te$ compounds with increasing interstitial iron
journal, October 2014

Spatial complexity due to bulk electronic nematicity in a superconducting underdoped cuprate
journal, January 2012

Coherence–incoherence crossover in the normal state of iron oxypnictides and importance of Hund's rule coupling
journal, February 2009

The energy gap of the compound FeSe0.5Te0.5 determined by specific heat and Point Contact Spectroscopy
journal, October 2015

Ubiquitous signatures of nematic quantum criticality in optimally doped Fe-based superconductors
journal, May 2016

Tunable ( $δ π$ , $δ π$ )-Type Antiferromagnetic Order in $α$ -Fe(Te,Se) Superconductors
journal, June 2009

Nanoscale chemical phase separation in FeTe $_{0.55}$ Se $_{0.45}$ as seen via scanning tunneling spectroscopy
journal, June 2011

Structural instabilities in lanthanum cuprate superconductors
journal, April 1994

Coupling of spin and orbital excitations in the iron-based superconductor ${FeSe}_{0.5} {Te}_{0.5}$
journal, June 2010

A key role for unusual spin dynamics in ferropnictides
journal, December 2008

Superconductivity close to magnetic instability in $Fe {({Se}_{1 - x} {Te}_{x})}_{0.82}$
journal, December 2008