Symmetric and antisymmetric strain as continuous tuning parameters for electronic nematic order

M. S. Ikeda, T. Worasaran, J. C. Palmstrom, J. A. W. Straquadine, P. Walmsley, and I. R. Fisher
Phys. Rev. B 98, 245133 – Published 21 December 2018

Abstract

We report the separate response of the critical temperature of the nematic phase transition TS to symmetric and antisymmetric strains for the prototypical underdoped iron pnictide Ba(Fe0.975Co0.025)2As2. This decomposition is achieved by comparing the response of TS to in-plane uniaxial stress and hydrostatic pressure. In addition to quantifying the two distinct linear responses to symmetric strains, we find a quadratic variation of TS as a response to antisymmetric strains ɛB1g=12(ɛxxɛyy), exceeding the nonlinear response to symmetric strains by at least two orders of magnitude. These observations establish orthogonal antisymmetric strain as a powerful tuning parameter for nematic order.

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  • Received 10 May 2018
  • Revised 19 November 2018

DOI:https://doi.org/10.1103/PhysRevB.98.245133

©2018 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

M. S. Ikeda, T. Worasaran, J. C. Palmstrom, J. A. W. Straquadine, P. Walmsley, and I. R. Fisher

  • Geballe Laboratory for Advanced Materials and Department of Applied Physics, Stanford University, Stanford, California 94305, USA and Stanford Institute for Materials and Energy Science, SLAC National Accelerator Laboratory, 2575 Sand Hill Road, Menlo Park, California 94025, USA

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Issue

Vol. 98, Iss. 24 — 15 December 2018

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