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  • Letter
  • Open Access

Tuning superconductivity and spin-vortex instabilities in CaKFe4As4 through in-plane antisymmetric strains

Adrian Valadkhani1, Belén Zúñiga Céspedes2, Salony Mandloi2, Mingyu Xu3,4, Juan Schmidt3,4, Sergey L. Bud'ko3,4, Paul C. Canfield3,4, Roser Valentí1, and Elena Gati2,*

  • 1Institute for Theoretical Physics, Goethe University Frankfurt, 60438 Frankfurt am Main, Germany
  • 2Max Planck Institute for Chemical Physics of Solids, 01187 Dresden, Germany
  • 3Ames National Laboratory, U.S. Department of Energy, Iowa State University, Ames, Iowa 50011, USA
  • 4Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA

  • *elena.gati@cpfs.mpg.de
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Phys. Rev. B 109, L180503 – Published 8 May, 2024

DOI: https://doi.org/10.1103/PhysRevB.109.L180503

Abstract

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 CaKFe4As4 under large, in-plane strains of B1g and B2g symmetry. In contrast to the majority of iron-based superconductors, pure CaKFe4As4 exhibits superconductivity with a relatively high transition temperature of Tc∼35K 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 Tc and the favored SVC configuration in CaKFe4As4. This supports a scenario, in which the change in spin fluctuations dominates the strain response of superconducting Tc. Overall, by suggesting moderate B2g 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.

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Phys. Rev. B 109, L180503– Published 8 May, 2024
  • Received 20 July 2023
  • Revised 12 April 2024
  • Accepted 29 April 2024
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Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Open access publication funded by Max Planck Society.

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