Hydrostatic and Uniaxial Pressure Tuning of Iron-Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

Gati, Elena; Xiang, Li; Bud'ko, Sergey L.; Canfield, Paul C.

doi:10.1002/andp.202000248

Title: Hydrostatic and Uniaxial Pressure Tuning of Iron-Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

Abstract

Iron-based superconductors are well-known for their intriguing phase diagrams, which manifest a complex interplay of electronic, magnetic and structural degrees of freedom. Among the phase transitions observed are superconducting, magnetic, and several types of structural transitions, including a tetragonal-to-orthorhombic and a collapsed-tetragonal transition. In particular, the widely-observed tetragonal-to-orthorhombic transition is believed to be a result of an electronic order that is coupled to the crystalline lattice and is, thus, referred to asnematic transition. Nematicity is therefore a prominent feature of these materials, which signals the importance of the coupling of electronic and lattice properties. Correspondingly, these systems are particularly susceptible to tuning via pressure (hydrostatic, uniaxial, or some combination). We review efforts to probe the phase diagrams of pressure-tuned iron-based superconductors, with a strong focus on our own recent insights into the phase diagrams of several members of this mate-rial class under hydrostatic pressure. These studies on FeSe, Ba(Fe_1-xCo_x)₂As₂, Ca(Fe_1-xCo_x)₂As₂ and CaK(Fe_1-xNi_x)₄As₄were, to a significant extent, made possible by advances of what measurements can be adapted to the use under differing pressure environments. We point out the potential impact of these tools for the study of the wider class of strongly correlated electron systems.

Authors:

^[1]; Xiang, Li ^[1]; Bud'ko, Sergey L. ^[1]; Canfield, Paul C. ^[1]

Ames Lab., Ames, IA (United States); Iowa State Univ., Ames, IA (United States)

Publication Date:: Thu Aug 20 00:00:00 EDT 2020

Research Org.:: Ames Laboratory (AMES), Ames, IA (United States)

Sponsoring Org.:: USDOE

OSTI Identifier:: 1650577

Alternate Identifier(s):: OSTI ID: 1648575

Report Number(s):: IS-J-10,287
Journal ID: ISSN 0003-3804; TRN: US2202727

Grant/Contract Number:: AC02‐07CH11358; GBMF4411

Resource Type:: Accepted Manuscript

Journal Name:: Annalen der Physik (Leipzig)

Additional Journal Information:: Journal Name: Annalen der Physik (Leipzig); Journal Volume: 532; Journal Issue: 10; Journal ID: ISSN 0003-3804

Publisher:: Wiley

Country of Publication:: United States

Language:: English

Subject:: 75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY

Citation Formats


                    Gati, Elena, Xiang, Li, Bud'ko, Sergey L., and Canfield, Paul C. Hydrostatic and Uniaxial Pressure Tuning of Iron-Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions.  United States: N. p., 2020. 
Web.  doi:10.1002/andp.202000248.

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                    Gati, Elena, Xiang, Li, Bud'ko, Sergey L., & Canfield, Paul C. Hydrostatic and Uniaxial Pressure Tuning of Iron-Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions.  United States.  https://doi.org/10.1002/andp.202000248

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                    Gati, Elena, Xiang, Li, Bud'ko, Sergey L., and Canfield, Paul C. Thu .  
"Hydrostatic and Uniaxial Pressure Tuning of Iron-Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions".  United States.  https://doi.org/10.1002/andp.202000248.  https://www.osti.gov/servlets/purl/1650577.

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@article{osti_1650577,

  title        = {Hydrostatic and Uniaxial Pressure Tuning of Iron-Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions},

  author       = {Gati, Elena and Xiang, Li and Bud'ko, Sergey L. and Canfield, Paul C.},

  abstractNote = {Iron-based superconductors are well-known for their intriguing phase diagrams, which manifest a complex interplay of electronic, magnetic and structural degrees of freedom. Among the phase transitions observed are superconducting, magnetic, and several types of structural transitions, including a tetragonal-to-orthorhombic and a collapsed-tetragonal transition. In particular, the widely-observed tetragonal-to-orthorhombic transition is believed to be a result of an electronic order that is coupled to the crystalline lattice and is, thus, referred to asnematic transition. Nematicity is therefore a prominent feature of these materials, which signals the importance of the coupling of electronic and lattice properties. Correspondingly, these systems are particularly susceptible to tuning via pressure (hydrostatic, uniaxial, or some combination). We review efforts to probe the phase diagrams of pressure-tuned iron-based superconductors, with a strong focus on our own recent insights into the phase diagrams of several members of this mate-rial class under hydrostatic pressure. These studies on FeSe, Ba(Fe1-xCox)2As2, Ca(Fe1-xCox)2As2 and CaK(Fe1-xNix)4As4were, to a significant extent, made possible by advances of what measurements can be adapted to the use under differing pressure environments. We point out the potential impact of these tools for the study of the wider class of strongly correlated electron systems.},

  doi          = {10.1002/andp.202000248},

  journal      = {Annalen der Physik (Leipzig)},

  number       = 10,

  volume       = 532,

  place        = {United States},

  year         = {Thu Aug 20 00:00:00 EDT 2020},

  month        = {Thu Aug 20 00:00:00 EDT 2020}

}

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Title: Hydrostatic and Uniaxial Pressure Tuning of Iron-Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions

Abstract

Citation Formats

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

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

Tuning the ground state of BaFe 2 As 2 : Phase diagrams and empirical trends journal, August 2011

Coexistence of superconductivity and magnetism in CaK ( Fe 1 − x Ni x ) 4 As 4 as probed by 57 Fe Mössbauer spectroscopy journal, October 2018

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

Microscopic Modeling of Correlated Systems Under Pressure: Representative Examples journal, March 2019

Electronic phase diagram of the iron-based high- T c superconductor Ba ( Fe 1 − x Co x ) 2 As 2 under hydrostatic pressure ( 0 ≤ x ≤ 0.099 ) journal, June 2009

Consistent model of magnetism in ferropnictides journal, March 2011

Effect of magnetic frustration on nematicity and superconductivity in iron chalcogenides journal, August 2015

Conventional empirical law reverses in the phase transitions of 122-type iron-based superconductors journal, November 2014

Bulk Superconductivity and Role of Fluctuations in the Iron-Based Superconductor FeSe at High Pressures journal, October 2019

Enhanced nematic fluctuations near an antiferromagnetic Mott insulator and possible application to high-Tc cuprates journal, January 2019

Combined effects of Sr substitution and pressure on the ground states in CaFe 2 As 2 journal, October 2016

Nematic phase without Heisenberg physics in FeAs planes journal, December 2011

Phase diagram of Ba 1 − x K x Fe 2 As 2 journal, May 2012

Uniaxial-strain mechanical detwinning of CaFe 2 As 2 and BaFe 2 As 2 crystals: Optical and transport study journal, May 2010

Magnetic ground state of FeSe journal, July 2016

NMR evidence for static local nematicity and its cooperative interplay with low-energy magnetic fluctuations in FeSe under pressure journal, November 2017

Origin of nematic order in FeSe journal, May 2015

Dome of magnetic order inside the nematic phase of sulfur-substituted FeSe under pressure journal, July 2017

Thermal expansion and anisotropic pressure derivatives of T c in Ba ( Fe 1 − x Co x ) 2 As 2 single crystals journal, February 2009

Measurement of elastoresistivity at finite frequency by amplitude demodulation journal, October 2018

Calorimetric investigation of CeRu2Ge2 up to 8 GPa journal, January 2000

Nematic quantum critical point without magnetism in FeSe 1− x S x superconductors journal, July 2016

Pressure Induced Stripe-Order Antiferromagnetism and First-Order Phase Transition in Fese journal, November 2016

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

BCS-like critical fluctuations with limited overlap of Cooper pairs in FeSe journal, August 2017

Orbital ordering and unfrustrated ( π , 0 ) magnetism from degenerate double exchange in the iron pnictides journal, July 2010

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

Pressure Induced Superconductivity in CaFe 2 As 2 journal, July 2008

Orbital order and spontaneous orthorhombicity in iron pnictides journal, September 2010

Pressure-Induced Antiferromagnetic Transition and Phase Diagram in FeSe journal, June 2015

Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors journal, August 2019

Collapsed tetragonal phase and superconductivity of BaFe 2 As 2 under high pressure journal, October 2010

Structural, magnetic and superconducting phase transitions in CaFe2As2 under ambient and applied pressure journal, May 2009

Physical and magnetic properties of Ba ( Fe 1 − x Ru x ) 2 As 2 single crystals journal, July 2010

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Weakening of the diamagnetic shielding in FeSe 1 − x S x at high pressures journal, July 2017

Critical divergence of the symmetric ( A 1 g ) nonlinear elastoresistance near the nematic transition in an iron-based superconductor journal, November 2017

Pressure Induced Static Magnetic Order in Superconducting FeSe 1 − x journal, February 2010

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

Synthesis and properties of CaFe 2 As 2 single crystals journal, July 2008

Symmetric and antisymmetric strain as continuous tuning parameters for electronic nematic order journal, December 2018

Electronic and magnetic phase diagram of β-Fe1.01Se with superconductivity at 36.7 K under pressure journal, June 2009

Emergence of the nematic electronic state in FeSe journal, April 2015

Pressure-induced superconductivity in CaFe 2 As 2 journal, July 2008

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

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

Tuning the ground state of BaFe ₂ As ₂ : Phase diagrams and empirical trends
journal, August 2011

Coexistence of superconductivity and magnetism in $CaK (Fe_{1 - x} Ni_{x})_{4} As_{4}$ as probed by $^{57} Fe$ Mössbauer spectroscopy
journal, October 2018

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

Microscopic Modeling of Correlated Systems Under Pressure: Representative Examples
journal, March 2019

Electronic phase diagram of the iron-based high- $T_{c}$ superconductor $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ under hydrostatic pressure $(0 \leq x \leq 0.099)$
journal, June 2009

Consistent model of magnetism in ferropnictides
journal, March 2011

Effect of magnetic frustration on nematicity and superconductivity in iron chalcogenides
journal, August 2015

Conventional empirical law reverses in the phase transitions of 122-type iron-based superconductors
journal, November 2014

Bulk Superconductivity and Role of Fluctuations in the Iron-Based Superconductor FeSe at High Pressures
journal, October 2019

Enhanced nematic fluctuations near an antiferromagnetic Mott insulator and possible application to high-Tc cuprates
journal, January 2019

Combined effects of Sr substitution and pressure on the ground states in ${CaFe}_{2} {As}_{2}$
journal, October 2016

Nematic phase without Heisenberg physics in FeAs planes
journal, December 2011

Phase diagram of Ba $_{1 - x}$ K $_{x}$ Fe $_{2}$ As $_{2}$
journal, May 2012

Uniaxial-strain mechanical detwinning of ${CaFe}_{2} {As}_{2}$ and ${BaFe}_{2} {As}_{2}$ crystals: Optical and transport study
journal, May 2010

Magnetic ground state of FeSe
journal, July 2016

NMR evidence for static local nematicity and its cooperative interplay with low-energy magnetic fluctuations in FeSe under pressure
journal, November 2017

Origin of nematic order in FeSe
journal, May 2015

Dome of magnetic order inside the nematic phase of sulfur-substituted FeSe under pressure
journal, July 2017

Thermal expansion and anisotropic pressure derivatives of $T_{c}$ in $Ba {({Fe}_{1 - x} {Co}_{x})}_{2} {As}_{2}$ single crystals
journal, February 2009

Measurement of elastoresistivity at finite frequency by amplitude demodulation
journal, October 2018

Calorimetric investigation of CeRu2Ge2 up to 8 GPa
journal, January 2000

Nematic quantum critical point without magnetism in FeSe _{1− x} S _x superconductors
journal, July 2016

Pressure Induced Stripe-Order Antiferromagnetism and First-Order Phase Transition in Fese
journal, November 2016

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

BCS-like critical fluctuations with limited overlap of Cooper pairs in FeSe
journal, August 2017

Orbital ordering and unfrustrated $(π, 0)$ magnetism from degenerate double exchange in the iron pnictides
journal, July 2010

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

Pressure Induced Superconductivity in ${CaFe}_{2} {As}_{2}$
journal, July 2008

Orbital order and spontaneous orthorhombicity in iron pnictides
journal, September 2010

Pressure-Induced Antiferromagnetic Transition and Phase Diagram in FeSe
journal, June 2015

Momentum Dependence of the Nematic Order Parameter in Iron-Based Superconductors
journal, August 2019

Collapsed tetragonal phase and superconductivity of ${BaFe}_{2} {As}_{2}$ under high pressure
journal, October 2010

Structural, magnetic and superconducting phase transitions in CaFe2As2 under ambient and applied pressure
journal, May 2009

Physical and magnetic properties of $Ba {({Fe}_{1 - x} {Ru}_{x})}_{2} {As}_{2}$ single crystals
journal, July 2010

Nematicity and quantum paramagnetism in FeSe
journal, September 2015

Iron-Based Layered Superconductor: LaOFeP
journal, August 2006

ac susceptibility studies of the weak itinerant ferromagnet $Sr Ru O_{3}$ under high pressure to $34 GPa$
journal, July 2007

Maximizing T c by tuning nematicity and magnetism in FeSe1−x S x superconductors
journal, October 2017

Charge nematicity and electronic Raman scattering in iron-based superconductors
journal, January 2016

Breakdown of Hooke’s law of elasticity at the Mott critical endpoint in an organic conductor
journal, December 2016

Lattice Effects on Nematic Quantum Criticality in Metals
journal, June 2017

Commonalities in phase and mode
journal, April 2009

Absence of superconductivity in single-phase ${CaFe}_{2} {As}_{2}$ under hydrostatic pressure
journal, January 2009

Correlation effects in the tetragonal and collapsed-tetragonal phase of ${CaFe}_{2} {As}_{2}$
journal, August 2014

Solidification and loss of hydrostaticity in liquid media used for pressure measurements
journal, December 2015

Doping a Mott insulator: Physics of high-temperature superconductivity
journal, January 2006

Spin-orbital frustrations and anomalous metallic state in iron-pnictide superconductors
journal, February 2009

Giant superconducting fluctuations in the compensated semimetal FeSe at the BCS–BEC crossover
journal, September 2016

Coexistence of superconductivity and magnetism in FeSe $_{1 - x}$ under pressure
journal, February 2012

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

Collapsed tetragonal phase as a strongly covalent and fully nonmagnetic state: Persistent magnetism with interlayer As–As bond formation in Rh-doped ${Ca}_{0.8} {Sr}_{0.2} {Fe}_{2} {As}_{2}$
journal, January 2018

Strong cooperative coupling of pressure-induced magnetic order and nematicity in FeSe
journal, September 2016

Effect of Biaxial Strain on the Phase Transitions of $Ca ({Fe}_{1 - x} {Co}_{x})_{2} {As}_{2}$
journal, March 2017

Electronic nematic susceptibility of iron-based superconductors
journal, January 2016

Symmetry-breaking orbital anisotropy observed for detwinned Ba(Fe1-xCox)2As2 above the spin density wave transition
journal, April 2011

A uniaxial stress capacitive dilatometer for high-resolution thermal expansion and magnetostriction under multiextreme conditions
journal, July 2016

Electrical transport measurements under pressure for BaFe ₂ As ₂ compounds doped with Co, Cr, or Sn
journal, April 2010

Magnetic excitations in iron chalcogenide superconductors
journal, October 2012

Superconductivity at 35.5 K in K-Doped CaFe2As2
journal, March 2013

Elastoresistive and elastocaloric anomalies at magnetic and electronic-nematic critical points
journal, March 2019

Decoupling of the superconducting and magnetic/structural phase transitions in electron-doped ${BaFe}_{2} {As}_{2}$
journal, August 2009

Quantum Vortex Core and Missing Pseudogap in the Multiband BCS-BEC Crossover Superconductor FeSe
journal, February 2019

Nematic Susceptibility of Hole-Doped and Electron-Doped ${Ba F e}_{2} {As}_{2}$ Iron-Based Superconductors from Shear Modulus Measurements
journal, January 2014

Weakening of the diamagnetic shielding in ${FeSe}_{1 - x} S_{x}$ at high pressures
journal, July 2017

Critical divergence of the symmetric ( $A_{1 g}$ ) nonlinear elastoresistance near the nematic transition in an iron-based superconductor
journal, November 2017

Pressure Induced Static Magnetic Order in Superconducting ${FeSe}_{1 - x}$
journal, February 2010

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

Synthesis and properties of CaFe ₂ As ₂ single crystals
journal, July 2008

Symmetric and antisymmetric strain as continuous tuning parameters for electronic nematic order
journal, December 2018

Electronic and magnetic phase diagram of β-Fe1.01Se with superconductivity at 36.7 K under pressure
journal, June 2009

Emergence of the nematic electronic state in FeSe
journal, April 2015

Pressure-induced superconductivity in CaFe ₂ As ₂
journal, July 2008

Spin Density Wave and Superconductivity in Highly Anisotropic Materials
journal, July 1981

Evidence from neutron diffraction for superconductivity in the stabilized tetragonal phase of ${CaFe}_{2} {As}_{2}$ under uniaxial pressure
journal, May 2010

Making and Breaking Bonds in the Solid State: The ThCr ₂ Si ₂ Structure
journal, September 1985

Measurement of the elastoresistivity coefficients of the underdoped iron arsenide Ba(Fe $_{0.975}$ Co $_{0.025}$ ) $_{2}$ As $_{2}$
journal, August 2013

Synergy and competition between superconductivity and antiferromagnetism in FeSe under pressure
journal, February 2019

Use of Cernox thermometers in AC specific heat measurements under pressure
journal, February 2019