Dominant In-Plane Symmetric Elastoresistance in CsFe2As2

Wiecki, P. and Haghighirad, A.-A. and Weber, F. and Merz, M. and Heid, R. and Böhmer, A.E.

Volume: 125 Pages:
DOI: 10.1103/PhysRevLett.125.187001
Published: 2020

We study the elastoresistance of the highly correlated material CsFe2As2 in all symmetry channels. Neutralizing its thermal expansion by means of a piezoelectric-based strain cell is demonstrated to be essential. The elastoresistance response in the in-plane symmetric channel is found to be large, while the response in the symmetry-breaking channels is weaker and provides no evidence for a divergent nematic susceptibility. Rather, our results can be interpreted naturally within the framework of a coherence-incoherence crossover, where the low-temperature coherent state is sensitively tuned by the in-plane atomic distances. © 2020 American Physical Society.

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