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)

*Work at Ames Laboratory was supported by the U.S. DOE, BES, DMSE. Ames Laboratory is operated for the U.S. DOE by Iowa State University under Contract No. DE-AC02-07CH11358.
WRM was supported by the Gordon and Betty Moore Foundation’s EPiQS Initiative through Grant GBMF4411.

–

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