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Elastoresistance of CaK(Fe,Ni)<sub>4</sub>As<sub>4</sub>

ORAL

Abstract

Elastoresistance describes the resistance change induced by an elastic deformation. In the well-known compound BaFe2As2 with clear nematicity, a diverging elastoresistance has been taken as a measure of the nematic susceptibility [1]. In contrast to BaFe2As2, the related CaK(Fe,Ni)4As4 orders antiferromagnetically as a so-called spin-vortex crystal (SVC) [2], which does not entail any nematicity. Here, we have determined the elastoresistance of CaK(Fe1-xNix)4As4 (x=0-0.05), spanning the phase diagram from a superconducting sample with Tc=35 K and no magnetic order, to a sample with magnetic order at a high TN=51 K having Tc=10 K. The nematic susceptibility for SVC order is analyzed theoretically via a Ginzburg-Landau expansion and compared with the elastoresistance data. Implications on the place of CaK(Fe,Ni)4As4 in the wider material class and the factors contributing to elastoresistance are discussed.
[1] Chu et al., Science 337, 710 (2012)
[2] Meier et al., npj Quantum Materials, 3, 5, (2018)

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Presenters

  • Anna Boehmer

    Institute for Solid State Physics, Karlsruhe Insitute of Technology, Karlsruhe Institute of Technology, Karlsruhe Institute of Technology; Ames Laboratory

Authors

  • Anna Boehmer

    Institute for Solid State Physics, Karlsruhe Insitute of Technology, Karlsruhe Institute of Technology, Karlsruhe Institute of Technology; Ames Laboratory

  • William Meier

    Oak Ridge National Lab, Ames Laboratory, Iowa State University, Ames; Oak Ridge National Laboratory, Oak Ridge, Ames Laboratory, Iowa State University

  • Mingyu Xu

    Iowa State University, Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA, Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames, Ames Laboratory, Iowa State University

  • Gil Drachuck

    Ames Laboratory, Iowa State University

  • Paul Wiecki

    Karlsruhe Institute of Technology

  • Sergey L. Bud'ko

    Ames Laboratory, Iowa State University, Dept. of Physics and Astronomy, Ames, Ames Laboratory, Iowa State University, Department of Physics and Astronomy, Ames Laboratory/Iowa State Univeristy

  • Christoph Meingast

    Karlsruhe Institute of Technology

  • Fei Chen

    University of Minnesota

  • Morten Holm Christensen

    University of Minnesota

  • Rafael Fernandes

    University of Minnesota, Physics, University of Minnesota, School of Physics and Astronomy, University of Minnesota

  • Paul C Canfield

    Iowa State University, Ames Laboratory and Iowa State University, Ames Lab, Ames Laboratory and Department of Physics and Astronomy, Iowa State University, Ames, Iowa 50011, USA, Ames laboratory, Ames, IA, Ames Laboratory, Iowa State University, Department of Physics & Astronomy, Iowa State University/Ames Laboratory, Department of Physics and Astronomy, Iowa State University/Ames Laboratory, Iowa State University and Ames Laboratory, Iowa State University, Ames Laboratory, Department of Physics and Astronomy, Iowa State University, Division of Materials Sciences & Engineering, Ames Lab and Iowa State University, Department of Physics and Astronomy, Ames Laboratory/Iowa State Univeristy, Iowa State University/Ames Laboratory