Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr0.67Na0.33Fe2As2

Yang, R.; Huang, J. W.; Zaki, N.; Pletikosić, I.; Dai, Y. M.; Xiao, H.; Valla, T.; Johnson, P. D.; Zhou, X. J.; Qiu, X. G.; Homes, C. C.

doi:10.1103/PhysRevB.100.235132

Title: Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor ${Sr}_{0.67} {Na}_{0.33} {Fe}_{2} {As}_{2}$

Abstract

We report the temperature-dependent optical conductivity and angle-resolved photoemission spectroscopy (ARPES) studies of the multiband iron-based superconductor ${Sr}_{0.67} {Na}_{0.33} {Fe}_{2} {As}_{2}$ . Measurements were made in the high-temperature tetragonal paramagnetic phase, below the structural and magnetic transitions at $$T_N$$ $$≃$$ 125 K in the orthorhombic spin-density-wave (SDW)-like phase and $$T_r$$ $$≃$$42 K in the reentrant tetragonal double-Q magnetic phase where both charge and SDWorder exist, and below the superconducting transition at $$T_c$$ $$≃$$ 10 K. The free-carrier component in the optical conductivity is described by two Drude contributions: one strong and broad and the other weak and narrow. The broad Drude component decreases dramatically below TN and Tr , with much of its strength being transferred to a bound excitation in the midinfrared, while the narrow Drude component shows no anomalies at either of the transitions, actually increasing in strength at low temperature while narrowing dramatically. The behavior of an infrared-active mode suggests zone folding below Tr. Below Tc the dramatic decrease in the low-frequency optical conductivity signals the formation of a superconducting energy gap. ARPES reveals holelike bands at the center of the Brillouin zone (BZ), with both electron- and holelike bands at the corners. Below $$T_N$$, the hole pockets at the center of the BZ decrease in size, consistent with the behavior of the broad Drude component; however, below $$T_r$$ the electronlike bands shift and split, giving rise to a low-energy excitation in the optical conductivity at $$≃$$20 meV. The $$C_2$$ and $$C_4$$ magnetic states, with resulting spin-density-wave and charge-SDW order, respectively, lead to a significant reconstruction of the Fermi surface that has profound implications for the transport originating from the electron and hole pockets but appears to have relatively little impact on the superconductivity in this material.

Authors:

Yang, R. ^[1]; Huang, J. W. ^[2]; Zaki, N. ^[3]; Pletikosić, I. ^[4]; Dai, Y. M. ^[5];

^[6];

^[3]; Johnson, P. D. ^[3]; Zhou, X. J. ^[7]; Qiu, X. G. ^[8];

^[3]

Brookhaven National Lab. (BNL), Upton, NY (United States); Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics
Brookhaven National Lab. (BNL), Upton, NY (United States)
Brookhaven National Lab. (BNL), Upton, NY (United States); Princeton Univ., NJ (United States). Dept. of Physics
Nanjing Univ. (China). Center for Superconducting Physics and Materials, National Lab. of Solid State Microstructures and Dept. of Physics
Center for High Pressure Science and Technology Advanced Research, Beijing (China)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics; Songshan Lake Materials Lab., Dongguan (China)
Chinese Academy of Sciences (CAS), Beijing (China). Inst. of Physics; Songshan Lake Materials Lab., Dongguan (China); Beijing Academy of Quantum Information Science, Beijing (China)

Publication Date:: Fri Dec 20 00:00:00 EST 2019

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

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

OSTI Identifier:: 1579492

Report Number(s):: BNL-212401-2019-JAAM
Journal ID: ISSN 2469-9950; PRBMDO; TRN: US2102249

Grant/Contract Number:: SC0012704

Resource Type:: Accepted Manuscript

Journal Name:: Physical Review B

Additional Journal Information:: Journal Volume: 100; Journal Issue: 23; Journal ID: ISSN 2469-9950

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; Electrical conductivity; Electronic structure; Optical conductivity; Optical phonons; Penetration depth

Citation Formats


                    Yang, R., Huang, J. W., Zaki, N., Pletikosić, I., Dai, Y. M., Xiao, H., Valla, T., Johnson, P. D., Zhou, X. J., Qiu, X. G., and Homes, C. C. Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr0.67Na0.33Fe2As2.  United States: N. p., 2019. 
Web.  doi:10.1103/PhysRevB.100.235132.

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                    Yang, R., Huang, J. W., Zaki, N., Pletikosić, I., Dai, Y. M., Xiao, H., Valla, T., Johnson, P. D., Zhou, X. J., Qiu, X. G., & Homes, C. C. Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr0.67Na0.33Fe2As2.  United States.  https://doi.org/10.1103/PhysRevB.100.235132

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                    Yang, R., Huang, J. W., Zaki, N., Pletikosić, I., Dai, Y. M., Xiao, H., Valla, T., Johnson, P. D., Zhou, X. J., Qiu, X. G., and Homes, C. C. Fri .  
"Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr0.67Na0.33Fe2As2".  United States.  https://doi.org/10.1103/PhysRevB.100.235132.  https://www.osti.gov/servlets/purl/1579492.

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@article{osti_1579492,

  title        = {Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr0.67Na0.33Fe2As2},

  author       = {Yang, R. and Huang, J. W. and Zaki, N. and Pletikosić, I. and Dai, Y. M. and Xiao, H. and Valla, T. and Johnson, P. D. and Zhou, X. J. and Qiu, X. G. and Homes, C. C.},

  abstractNote = {We report the temperature-dependent optical conductivity and angle-resolved photoemission spectroscopy (ARPES) studies of the multiband iron-based superconductor Sr0.67Na0.33Fe2As2. Measurements were made in the high-temperature tetragonal paramagnetic phase, below the structural and magnetic transitions at $T_N$ $≃$ 125 K in the orthorhombic spin-density-wave (SDW)-like phase and $T_r$ $≃$42 K in the reentrant tetragonal double-Q magnetic phase where both charge and SDWorder exist, and below the superconducting transition at $T_c$ $≃$ 10 K. The free-carrier component in the optical conductivity is described by two Drude contributions: one strong and broad and the other weak and narrow. The broad Drude component decreases dramatically below TN and Tr , with much of its strength being transferred to a bound excitation in the midinfrared, while the narrow Drude component shows no anomalies at either of the transitions, actually increasing in strength at low temperature while narrowing dramatically. The behavior of an infrared-active mode suggests zone folding below Tr. Below Tc the dramatic decrease in the low-frequency optical conductivity signals the formation of a superconducting energy gap. ARPES reveals holelike bands at the center of the Brillouin zone (BZ), with both electron- and holelike bands at the corners. Below $T_N$, the hole pockets at the center of the BZ decrease in size, consistent with the behavior of the broad Drude component; however, below $T_r$ the electronlike bands shift and split, giving rise to a low-energy excitation in the optical conductivity at $≃$20 meV. The $C_2$ and $C_4$ magnetic states, with resulting spin-density-wave and charge-SDW order, respectively, lead to a significant reconstruction of the Fermi surface that has profound implications for the transport originating from the electron and hole pockets but appears to have relatively little impact on the superconductivity in this material.},

  doi          = {10.1103/PhysRevB.100.235132},

  journal      = {Physical Review B},

  number       = 23,

  volume       = 100,

  place        = {United States},

  year         = {Fri Dec 20 00:00:00 EST 2019},

  month        = {Fri Dec 20 00:00:00 EST 2019}

}

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text, January 2009

Kofu, M.; Qiu, Y.; Bao, Wei
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DOI: 10.48550/arxiv.0901.0738

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Canfield, Paul C.; Bud'ko, Sergey L.
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DOI: 10.48550/arxiv.1002.0858

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Hancock, J. N.; Mirzaei, S. I.; Gillett, J.
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DOI: 10.48550/arxiv.1004.0111

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Paglione, Johnpierre; Greene, Richard L.
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DOI: 10.48550/arxiv.1006.4618

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DOI: 10.48550/arxiv.1202.3833

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Title: Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor Sr 0.67 Na 0.33 Fe 2 As 2

Abstract

Citation Formats

A universal scaling relation in high-temperature superconductors journal, July 2004

Antiferromagnetic order in CaK ( Fe 1 − x Ni x ) 4 As 4 and its interplay with superconductivity journal, June 2018

Scaling of the superfluid density in high-temperature superconductors journal, October 2005

Determination of the phase diagram of the electron-doped superconductor Ba ( Fe 1 − x Co x ) 2 As 2 journal, January 2009

Muon spin rotation study of the magnetic structure in the tetragonal antiferromagnetic state of weakly underdoped Ba 1− x K x Fe 2 As 2 journal, September 2015

Spontaneous Formation of a Superconducting and Antiferromagnetic Hybrid State in SrFe 2 As 2 under High Pressure journal, December 2009

Expansion of the tetragonal magnetic phase with pressure in the iron arsenide superconductor Ba 1 − x K x Fe 2 As 2 journal, April 2016

Unravelling the mechanism of the semiconducting-like behavior and its relation to superconductivity in ( CaFe 1 − x Pt x As ) 10 Pt 3 As 8 journal, April 2019

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

Superconductivity in Hole-Doped (Sr 1−x K x )Fe 2 As 2 journal, September 2008

Lattice and magnetic instabilities in CaFe 2 As 2 : A single-crystal neutron diffraction study journal, September 2008

Double-Q spin-density wave in iron arsenide superconductors journal, January 2016

Magnetism and charge dynamics in iron pnictides journal, February 2011

Pressure-induced Fermi-surface reconstruction in the iron-arsenide superconductor Ba 1 − x K x Fe 2 As 2 : Evidence of a phase transition inside the antiferromagnetic phase journal, October 2012

Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor journal, February 2018

Evolution of bulk superconductivity in SrFe 2 As 2 with Ni substitution journal, June 2009

Magnetically driven suppression of nematic order in an iron-based superconductor journal, May 2014

Structural and magnetic phase transitions in the ternary iron arsenides SrFe 2 As 2 and EuFe 2 As 2 journal, October 2008

Origin of the Spin Density Wave Instability in A Fe 2 As 2 ( A = Ba , Sr ) as Revealed by Optical Spectroscopy journal, December 2008

Detailed magnetic and structural analysis mapping a robust magnetic C 4 dome in Sr 1 − x Na x Fe 2 As 2 journal, April 2016

Complete pressure-dependent phase diagrams for SrFe 2 As 2 and BaFe 2 As 2 journal, June 2009

Structural properties and superconductivity of SrFe 2 As 2 − x P x (0.0 ≤ x ≤ 1.0) and CaFe 2 As 2 − y P y (0.0 ≤ y ≤ 0.3) journal, March 2010

Superconductivity up to 30 K in the vicinity of the quantum critical point in BaFe 2 (As 1− x P x ) 2 journal, August 2009

Optical properties of A Fe 2 As 2 ( A = Ca , Sr, and Ba) single crystals journal, November 2016

Zero-resistance superconducting phase in BaFe 2 As 2 under high pressure journal, May 2009

Structural transition and anisotropic properties of single-crystalline SrFe 2 As 2 journal, July 2008

High-temperature superconductivity in iron-based materials journal, August 2010

Disorder-promoted C 4 -symmetric magnetic order in iron-based superconductors journal, April 2016

Classical generalization of the Drude formula for the optical conductivity journal, September 2001

Fermi surface and effective masses in photoemission response of the (Ba1−x K x )Fe2As2 superconductor journal, August 2017

In-plane electronic anisotropy of underdoped ‘122’ Fe-arsenide superconductors revealed by measurements of detwinned single crystals journal, September 2011

Determination of the Superconducting Skin Depth from the Energy Gap and Sum Rule journal, April 1959

Pseudogap in underdoped Ba 1 − x K x Fe 2 As 2 as seen via optical conductivity journal, September 2012

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

Ground-state properties of lanthanum: Treatment of extended-core states journal, March 1991

Vibrational anomalies in A Fe 2 As 2 ( A =Ca, Sr, and Ba) single crystals journal, July 2018

Coherence, incoherence, and scaling along the c axis of Y Ba 2 Cu 3 O 6 + x journal, May 2005

Neutron scattering investigation of the magnetic order in single crystalline BaFe 2 As 2 journal, May 2009

Superconductivity-induced re-entrance of the orthorhombic distortion in Ba1−xKxFe2As2 journal, July 2015

Superconductivity up to 29 K in SrFe 2 As 2 and BaFe 2 As 2 at high pressures journal, December 2008

Magnetically polarized Ir dopant atoms in superconducting Ba(Fe 1 − x Ir x ) 2 As 2 journal, April 2012

FeTe 0.55 Se 0.45 : A multiband superconductor in the clean and dirty limit journal, April 2015

Electronic structure studies of BaFe 2 As 2 by angle-resolved photoemission spectroscopy journal, April 2009

Structure, Magnetism, and Superconductivity of the Layered Iron Arsenides Sr 1- x Na x Fe 2 As 2 journal, February 2011

Electronic structure and doping in BaFe 2 As 2 and LiFeAs: Density functional calculations journal, September 2008

Observation of the magnetic C 4 phase in Ca 1 − x Na x Fe 2 As 2 and its universality in the hole-doped 122 superconductors journal, February 2017

Superconducting state coexisting with a phase-separated static magnetic order in ( Ba , K ) Fe 2 As 2 , ( Sr , Na ) Fe 2 As 2 , and CaFe 2 As 2 journal, July 2009

Spectral Evidence for Emergent Order in Ba 1 − x Na x Fe 2 As 2 journal, September 2018

Spin reorientation in Ba 0.65 Na 0.35 Fe 2 As 2 studied by single-crystal neutron diffraction journal, February 2015

Technique for measuring the reflectance of irregular, submillimeter-sized samples journal, January 1993

(π, π) electronic order in iron arsenide superconductors journal, January 2009

Superconducting Fe-Based Compounds ( A 1 − x Sr x ) Fe 2 As 2 with A = K and Cs with Transition Temperatures up to 37 K journal, September 2008

Competing Electronic Phases near the Onset of Superconductivity in Hole-doped SrFe 2 As 2 journal, October 2019

FeAs-Based Superconductivity: A Case Study of the Effects of Transition Metal Doping on BaFe 2 As 2 journal, August 2010

Complex phase diagram of Ba 1 − x Na x Fe 2 As 2 : A multitude of phases striving for the electronic entropy journal, January 2016

Direct imaging of the structural domains in the iron pnictides A Fe 2 As 2 ( A = Ca , Sr , Ba ) journal, May 2009

Conductivity of Superconducting Films: A Sum Rule journal, February 1958

Fast recovery of the stripe magnetic order by Mn/Fe substitution in F-doped LaFeAsO superconductors journal, May 2017

Optical investigations of the normal and superconducting states reveal two electronic subsystems in iron pnictides journal, March 2010

High-temperature superconductivity in iron pnictides and chalcogenides journal, March 2016

Spin and lattice structures of single-crystalline SrFe 2 As 2 journal, October 2008

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

Infrared Study of the Spin Reorientation Transition and Its Reversal in the Superconducting State in Underdoped Ba 1 − x K x Fe 2 As 2 journal, July 2015

Superconductivity at 22 K in Co-Doped BaFe 2 As 2 Crystals journal, September 2008

Antiferromagnetic ordering in the absence of structural distortion in Ba ( Fe 1 − x Mn x ) 2 As 2 journal, December 2010

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides journal, October 2010

Optical properties of the iron arsenic superconductor BaFe 1.85 Co 0.15 As 2 journal, November 2010

Infrared Study of the Spin Reorientation Transition and Its Reversal in the Superconducting State in Underdoped Ba1-x KxFe2As2 text, January 2021

Structural and magnetic phase transitions in the ternary iron arsenides SrFe2As2 and EuFe2As2 text, January 2008

(pi,pi)-electronic order in iron arsenide superconductors text, January 2008

Neutron scattering investigation of the magnetic order in single crystalline BaFe2As2 text, January 2009

FeAs-based superconductivity: a case study of the effects of transition metal doping on BaFe2As2 text, January 2010

Strong coupling to magnetic fluctuations in the charge dynamics of Fe-based superconductors text, January 2010

High-temperature superconductivity in iron-based materials text, January 2010

Pseudogap in underdoped Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$ as seen via optical conductivity text, January 2012

Magnetically-Driven Suppression of Nematic Order in an Iron-Based Superconductor text, January 2013

Antiferromagnetic order and spin dynamics in iron-based superconductors text, January 2015

Title: Optical and photoemission investigation of structural and magnetic transitions in the iron-based superconductor ${Sr}_{0.67} {Na}_{0.33} {Fe}_{2} {As}_{2}$

A universal scaling relation in high-temperature superconductors
journal, July 2004

Antiferromagnetic order in ${CaK (Fe}_{1 - x} {Ni}_{x})_{4} {As}_{4}$ and its interplay with superconductivity
journal, June 2018

Scaling of the superfluid density in high-temperature superconductors
journal, October 2005

Determination of the phase diagram of the electron-doped superconductor $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$
journal, January 2009

Muon spin rotation study of the magnetic structure in the tetragonal antiferromagnetic state of weakly underdoped Ba _{1− x} K _x Fe ₂ As ₂
journal, September 2015

Spontaneous Formation of a Superconducting and Antiferromagnetic Hybrid State in ${SrFe}_{2} {As}_{2}$ under High Pressure
journal, December 2009

Expansion of the tetragonal magnetic phase with pressure in the iron arsenide superconductor ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$
journal, April 2016

Unravelling the mechanism of the semiconducting-like behavior and its relation to superconductivity in $({CaFe}_{1 - x} {Pt}_{x} As)_{10} {Pt}_{3} {As}_{8}$
journal, April 2019

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

Superconductivity in Hole-Doped (Sr _1−x K _x )Fe ₂ As ₂
journal, September 2008

Lattice and magnetic instabilities in ${CaFe}_{2} {As}_{2}$ : A single-crystal neutron diffraction study
journal, September 2008

Double-Q spin-density wave in iron arsenide superconductors
journal, January 2016

Magnetism and charge dynamics in iron pnictides
journal, February 2011

Pressure-induced Fermi-surface reconstruction in the iron-arsenide superconductor Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ : Evidence of a phase transition inside the antiferromagnetic phase
journal, October 2012

Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor
journal, February 2018

Evolution of bulk superconductivity in ${SrFe}_{2} {As}_{2}$ with Ni substitution
journal, June 2009

Magnetically driven suppression of nematic order in an iron-based superconductor
journal, May 2014

Structural and magnetic phase transitions in the ternary iron arsenides SrFe ₂ As ₂ and EuFe ₂ As ₂
journal, October 2008

Origin of the Spin Density Wave Instability in $A {Fe}_{2} {As}_{2}$ ( $A = Ba, Sr$ ) as Revealed by Optical Spectroscopy
journal, December 2008

Detailed magnetic and structural analysis mapping a robust magnetic $C_{4}$ dome in ${Sr}_{1 - x} {Na}_{x} {Fe}_{2} {As}_{2}$
journal, April 2016

Complete pressure-dependent phase diagrams for ${SrFe}_{2} {As}_{2}$ and ${BaFe}_{2} {As}_{2}$
journal, June 2009

Structural properties and superconductivity of SrFe ₂ As _{2 − x} P _x (0.0 ≤ x ≤ 1.0) and CaFe ₂ As _{2 − y} P _y (0.0 ≤ y ≤ 0.3)
journal, March 2010

Superconductivity up to 30 K in the vicinity of the quantum critical point in BaFe ₂ (As _{1− x} P _x ) ₂
journal, August 2009

Optical properties of $A {Fe}_{2} {As}_{2}$ ( $A = Ca$ , Sr, and Ba) single crystals
journal, November 2016

Zero-resistance superconducting phase in ${BaFe}_{2} {As}_{2}$ under high pressure
journal, May 2009

Structural transition and anisotropic properties of single-crystalline ${SrFe}_{2} {As}_{2}$
journal, July 2008

High-temperature superconductivity in iron-based materials
journal, August 2010

Disorder-promoted $C_{4}$ -symmetric magnetic order in iron-based superconductors
journal, April 2016

Classical generalization of the Drude formula for the optical conductivity
journal, September 2001

Fermi surface and effective masses in photoemission response of the (Ba1−x K x )Fe2As2 superconductor
journal, August 2017

In-plane electronic anisotropy of underdoped ‘122’ Fe-arsenide superconductors revealed by measurements of detwinned single crystals
journal, September 2011

Determination of the Superconducting Skin Depth from the Energy Gap and Sum Rule
journal, April 1959

Pseudogap in underdoped Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$ as seen via optical conductivity
journal, September 2012

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

Ground-state properties of lanthanum: Treatment of extended-core states
journal, March 1991

Vibrational anomalies in $A {Fe}_{2} {As}_{2}$ ( $A$ =Ca, Sr, and Ba) single crystals
journal, July 2018

Coherence, incoherence, and scaling along the $c$ axis of $Y {Ba}_{2} {Cu}_{3} O_{6 + x}$
journal, May 2005

Neutron scattering investigation of the magnetic order in single crystalline BaFe ₂ As ₂
journal, May 2009

Superconductivity-induced re-entrance of the orthorhombic distortion in Ba1−xKxFe2As2
journal, July 2015

Superconductivity up to 29 K in SrFe ₂ As ₂ and BaFe ₂ As ₂ at high pressures
journal, December 2008

Magnetically polarized Ir dopant atoms in superconducting Ba(Fe $_{1 - x}$ Ir $_{x}$ ) $_{2}$ As $_{2}$
journal, April 2012

${FeTe}_{0.55} {Se}_{0.45}$ : A multiband superconductor in the clean and dirty limit
journal, April 2015

Electronic structure studies of ${BaFe}_{2} {As}_{2}$ by angle-resolved photoemission spectroscopy
journal, April 2009

Structure, Magnetism, and Superconductivity of the Layered Iron Arsenides Sr _{1- x} Na _x Fe ₂ As ₂
journal, February 2011

Electronic structure and doping in ${BaFe}_{2} {As}_{2}$ and LiFeAs: Density functional calculations
journal, September 2008

Observation of the magnetic $C_{4}$ phase in ${Ca}_{1 - x} {Na}_{x} {Fe}_{2} {As}_{2}$ and its universality in the hole-doped 122 superconductors
journal, February 2017

Superconducting state coexisting with a phase-separated static magnetic order in $(Ba, K) {Fe}_{2} {As}_{2}$ , $(Sr, Na) {Fe}_{2} {As}_{2}$ , and ${CaFe}_{2} {As}_{2}$
journal, July 2009

Spectral Evidence for Emergent Order in ${Ba}_{1 - x} {Na}_{x} {Fe}_{2} {As}_{2}$
journal, September 2018

Spin reorientation in ${Ba}_{0.65} {Na}_{0.35} {Fe}_{2} {As}_{2}$ studied by single-crystal neutron diffraction
journal, February 2015

Technique for measuring the reflectance of irregular, submillimeter-sized samples
journal, January 1993

(π, π) electronic order in iron arsenide superconductors
journal, January 2009

Superconducting Fe-Based Compounds $(A_{1 - x} {Sr}_{x}) {Fe}_{2} {As}_{2}$ with $A = K$ and Cs with Transition Temperatures up to 37 K
journal, September 2008

Competing Electronic Phases near the Onset of Superconductivity in Hole-doped SrFe ₂ As ₂
journal, October 2019

FeAs-Based Superconductivity: A Case Study of the Effects of Transition Metal Doping on BaFe ₂ As ₂
journal, August 2010

Complex phase diagram of ${Ba}_{1 - x} {Na}_{x} {Fe}_{2} {As}_{2}$ : A multitude of phases striving for the electronic entropy
journal, January 2016

Direct imaging of the structural domains in the iron pnictides $A {Fe}_{2} {As}_{2}$ $(A = Ca, Sr, Ba)$
journal, May 2009

Conductivity of Superconducting Films: A Sum Rule
journal, February 1958

Fast recovery of the stripe magnetic order by Mn/Fe substitution in F-doped LaFeAsO superconductors
journal, May 2017

Optical investigations of the normal and superconducting states reveal two electronic subsystems in iron pnictides
journal, March 2010

High-temperature superconductivity in iron pnictides and chalcogenides
journal, March 2016

Spin and lattice structures of single-crystalline ${SrFe}_{2} {As}_{2}$
journal, October 2008

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

Infrared Study of the Spin Reorientation Transition and Its Reversal in the Superconducting State in Underdoped ${Ba}_{1 - x} K_{x} {Fe}_{2} {As}_{2}$
journal, July 2015

Superconductivity at 22 K in Co-Doped ${BaFe}_{2} {As}_{2}$ Crystals
journal, September 2008

Antiferromagnetic ordering in the absence of structural distortion in $Ba {({Fe}_{1 - x} {Mn}_{x})}_{2} {As}_{2}$
journal, December 2010

The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenides
journal, October 2010

Optical properties of the iron arsenic superconductor ${BaFe}_{1.85} {Co}_{0.15} {As}_{2}$
journal, November 2010

Infrared Study of the Spin Reorientation Transition and Its Reversal in the Superconducting State in Underdoped Ba1-x KxFe2As2
text, January 2021

Structural and magnetic phase transitions in the ternary iron arsenides SrFe2As2 and EuFe2As2
text, January 2008

(pi,pi)-electronic order in iron arsenide superconductors
text, January 2008

Neutron scattering investigation of the magnetic order in single crystalline BaFe2As2
text, January 2009

FeAs-based superconductivity: a case study of the effects of transition metal doping on BaFe2As2
text, January 2010

Strong coupling to magnetic fluctuations in the charge dynamics of Fe-based superconductors
text, January 2010

High-temperature superconductivity in iron-based materials
text, January 2010

Pseudogap in underdoped Ba$_{1-x}$K$_{x}$Fe$_{2}$As$_{2}$ as seen via optical conductivity
text, January 2012

Magnetically-Driven Suppression of Nematic Order in an Iron-Based Superconductor
text, January 2013

Antiferromagnetic order and spin dynamics in iron-based superconductors
text, January 2015

Double-Q spin-density wave in iron arsenide superconductors
text, January 2015

Complex phase diagram of Ba$_{1-x}$Na$_{x}$Fe$_{2}$As$_{2}$: a multitude of phases striving for the electronic entropy
text, January 2015