Absence of nematic instability in LiFeAs

Michael Wissmann, Federico Caglieris, Xiaochen Hong, Saicharan Aswartham, Anna Vorobyova, Igor Morozov, Bernd Büchner, and Christian Hess
Phys. Rev. B 106, 054508 – Published 8 August 2022

Abstract

The relationship among unconventional superconductivity, antiferromagnetism, and nematic order in iron-based superconductors (FeSCs) is still highly debated. In many FeSCs superconductivity is in proximity of a nematically and magnetically ordered state. LiFeAs is an exceptional stoichiometric FeSC becoming superconducting below 18 K without undergoing a structural or magnetic transition. However, some recent experimental studies suggested the existence of finite nematic fluctuations and even a nematic superconducting state. In this paper, we employ elastoresistance as a measure of nematic fluctuations in pristine LiFeAs and compare the findings with the elastoresistance of LiFeAs at low Co and V doping levels as well with that of magnetically and nematically ordering NaFeAs. We find LiFeAs and cobalt-doped LiFeAs far away from a nematic instability.

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  • Received 7 February 2022
  • Accepted 29 June 2022

DOI:https://doi.org/10.1103/PhysRevB.106.054508

©2022 American Physical Society

Physics Subject Headings (PhySH)

Condensed Matter, Materials & Applied Physics

Authors & Affiliations

Michael Wissmann1,2, Federico Caglieris1,3,4, Xiaochen Hong1,5, Saicharan Aswartham1, Anna Vorobyova6, Igor Morozov6, Bernd Büchner1,2, and Christian Hess1,5,*

  • 1Leibniz Institute for Solid State and Materials Research IFW Dresden, 01069 Dresden, Germany
  • 2Institute of Solid State Physics, TU Dresden, 01069 Dresden, Germany
  • 3Department of Physics, University of Genova, via Dodecaneso 33, I-16146 Genova, Italy
  • 4CNR-SPIN Genova, via Dodecaneso 33, I-16146 Genova, Italy
  • 5Fakultät für Mathematik und Naturwissenschaften, Bergische Universität Wuppertal, 42097 Wuppertal, Germany
  • 6Departement of Chemistry, Lomonosov Moscow State University, Moscow 119991, Russia

  • *c.hess@uni-wuppertal.de

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Issue

Vol. 106, Iss. 5 — 1 August 2022

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