Title: Tuning superconductivity and spin-vortex instabilities in CaKFe 4 As 4 through in-plane antisymmetric strains

Journal Article · · Physical Review. B

Lattice strains of appropriate symmetry have served as an excellent tool to explore the interaction of superconductivity in the iron-based superconductors with orthorhombic-nematic and stripe spin-density-wave (SSDW) order. In this Letter, we contribute to a broader understanding of the coupling of strain to superconductivity and competing normal-state orders by studying CaKFe 4 As 4 under large, in-plane strains of B 1 g and B 2 g symmetry. In contrast to the majority of iron-based superconductors, pure CaKFe 4 As 4 exhibits superconductivity with a relatively high transition temperature of T c ∼ 35 K in proximity of a noncollinear, tetragonal, hedgehog spin-vortex crystal (SVC) order. Through experiments and calculations, we demonstrate an anisotropic in-plane strain response of T c and the favored SVC configuration in CaKFe 4 As 4 . This supports a scenario, in which the change in spin fluctuations dominates the strain response of superconducting T c . Overall, by suggesting moderate B 2 g strains as an effective parameter to change the stability of SVC and SSDW, we outline a pathway to a unified phase diagram of iron-based superconductivity. Published by the American Physical Society 2024

Research Organization:
Ames Laboratory (AMES), Ames, IA (United States)
Sponsoring Organization:
USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES). Materials Sciences & Engineering Division (MSE)
Grant/Contract Number:
AC02-07CH11358
OSTI ID:
2348978
Report Number(s):
IS-J-11,331; L180503
Journal Information:
Physical Review. B, Journal Name: Physical Review. B Journal Issue: 18 Vol. 109; ISSN 2469-9950; ISSN PRBMDO
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

References (65)

Hydrostatic and Uniaxial Pressure Tuning of Iron‐Based Superconductors: Insights into Superconductivity, Magnetism, Nematicity, and Collapsed Tetragonal Transitions journal August 2020
Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set journal July 1996
Using gap symmetry and structure to reveal the pairing mechanism in Fe-based superconductors journal January 2016
New-Structure-Type Fe-Based Superconductors: Ca A Fe 4 As 4 ( A = K, Rb, Cs) and Sr A Fe 4 As 4 ( A = Rb, Cs) journal March 2016
Superconductivity-induced re-entrance of the orthorhombic distortion in Ba1−xKxFe2As2 journal July 2015
What drives nematic order in iron-based superconductors? journal January 2014
Uniaxial strain control of spin-polarization in multicomponent nematic order of BaFe2As2 journal March 2018
Hedgehog spin-vortex crystal stabilized in a hole-doped iron-based superconductor journal February 2018
Suppression of superconductivity by anisotropic strain near a nematic quantum critical point journal August 2020
Nematicity and nematic fluctuations in iron-based superconductors journal December 2022
Piezoelectric-based apparatus for strain tuning journal June 2014
Piezoelectric-based uniaxial pressure cell with integrated force and displacement sensors journal February 2019
Ultrahigh elastically compressible and strain-engineerable intermetallic compounds under uniaxial mechanical loading journal June 2019
Rigid platform for applying large tunable strains to mechanically delicate samples journal August 2020
57 Fe Mössbauer study of stoichiometric iron-based superconductor CaKFe 4 As 4 : a comparison to KFe 2 As 2 and CaFe 2 As 2 journal July 2017
Nematicity, magnetism and superconductivity in FeSe journal December 2017
Inhomogeneous Electron Gas journal November 1964
Self-Consistent Equations Including Exchange and Correlation Effects journal November 1965
Strain tuning and anisotropic spin correlations in iron-based systems journal August 2019
Competing pairing interactions responsible for the large upper critical field in a stoichiometric iron-based superconductor CaKFe 4 As 4 journal April 2020
Superconductivity and phase diagrams of CaK(Fe1−xMnx)4As4 single crystals journal June 2022
Superconductivity and magnetic and transport properties of single-crystalline CaK(Fe1−xCrx)4As4 journal April 2023
Ab initiomolecular dynamics for liquid metals journal January 1993
Projector augmented-wave method journal December 1994
Efficient iterative schemes for ab initio total-energy calculations using a plane-wave basis set journal October 1996
From ultrasoft pseudopotentials to the projector augmented-wave method journal January 1999
Vestigial chiral and charge orders from bidirectional spin-density waves: Application to the iron-based superconductors journal January 2016
Anisotropic thermodynamic and transport properties of single-crystalline CaKFe 4 As 4 journal August 2016
Nodeless multiband superconductivity in stoichiometric single-crystalline CaKFe 4 As 4 journal March 2017
Signature of multigap nodeless superconductivity in CaKFe 4 As 4 journal April 2017
Electronic properties, low-energy Hamiltonian, and superconducting instabilities in CaKFe 4 As 4 journal September 2017
Magnetic fluctuations and superconducting properties of CaKFe 4 As 4 studied by As 75 NMR journal September 2017
Pressure-induced half-collapsed-tetragonal phase in CaKFe 4 As 4 journal October 2017
In-plane magnetic penetration depth of superconducting CaKFe 4 As 4 journal April 2018
Robust s ± pairing in CaK ( Fe 1 − x Ni x ) 4 As 4 ( x = 0 and 0.05) from the response to electron irradiation journal April 2018
Pressure-temperature phase diagrams of CaK ( Fe 1 − x Ni x ) 4 As 4 superconductors journal May 2018
Antiferromagnetic order in CaK ( Fe 1 − x Ni x ) 4 As 4 and its interplay with superconductivity journal June 2018
Indication of subdominant d -wave interaction in superconducting CaKFe 4 As 4 journal July 2018
Trends in pressure-induced layer-selective half-collapsed tetragonal phases in the iron-based superconductor family A e A Fe 4 As 4 journal August 2018
High- T c superconductivity in CaKFe 4 As 4 in absence of nematic fluctuations journal October 2018
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
Symmetric and antisymmetric strain as continuous tuning parameters for electronic nematic order journal December 2018
Nematicity as a Probe of Superconducting Pairing in Iron-Based Superconductors journal September 2013
Enhancement of Superconductivity near a Nematic Quantum Critical Point journal March 2015
Enhancement of the Superconducting Gap by Nesting in CaKFe 4 As 4 : A New High Temperature Superconductor journal December 2016
Odd and Even Modes of Neutron Spin Resonance in the Bilayer Iron-Based Superconductor CaKFe 4 As 4 journal June 2018
Hedgehog Spin-Vortex Crystal Antiferromagnetic Quantum Criticality in CaK ( Fe 1 − x Ni x ) 4 As 4 Revealed by NMR journal September 2018
Evolution from B 2 g Nematics to B 1 g Nematics in Heavily Hole-Doped Iron-Based Superconductors journal September 2019
Charge Density Waves in YBa 2 Cu 3 O 6.67 Probed by Resonant X-Ray Scattering under Uniaxial Compression journal January 2021
Spin Vortex Crystal Order in Organic Triangular Lattice Compound journal September 2021
Preferred Spin Excitations in the Bilayer Iron-Based Superconductor CaK ( Fe 0.96 Ni 0.04 ) 4 As 4 with Spin-Vortex Crystal Order journal March 2022
Generalized Gradient Approximation Made Simple journal October 1996
Optimization of the crystal growth of the superconductor CaKFe 4 As 4 from solution in the FeAs − CaFe 2 As 2 − KFe 2 As 2 system journal June 2017
Nonlinear uniaxial pressure dependence of Tc in iron-based superconductors journal December 2019
Relationship between Transport Anisotropy and Nematicity in FeSe journal May 2021
Colloquium : Theory of intertwined orders in high temperature superconductors journal May 2015
Antiferromagnetic order and spin dynamics in iron-based superconductors journal August 2015
Electronic Liquid Crystal State in the High-Temperature Superconductor YBa2Cu3O6.45 journal January 2008
Divergent Nematic Susceptibility in an Iron Arsenide Superconductor journal August 2012
Nematic quantum criticality in an Fe-based superconductor revealed by strain-tuning journal May 2021
Pairing Mechanism in Fe-Based Superconductors journal March 2012
Intertwined Vestigial Order in Quantum Materials: Nematicity and Beyond journal March 2019
Nematic Fermi Fluids in Condensed Matter Physics journal August 2010
FeAs-Based Superconductivity: A Case Study of the Effects of Transition Metal Doping on BaFe 2 As 2 journal August 2010
Spin Resonance in the New-Structure-Type Iron-Based Superconductor CaKFe 4 As 4 journal September 2017