Comparison of temperature and doping dependence of elastoresistivity near a putative nematic quantum critical point

Palmstrom, J. C.; Walmsley, P.; Straquadine, J. A. W.; Sorensen, M. E.; Hannahs, S. T.; Burns, D. H.; Fisher, I. R.

doi:10.1038/s41467-022-28583-3

Comparison of temperature and doping dependence of elastoresistivity near a putative nematic quantum critical point

Journal Article · Wed Feb 23 00:00:00 EST 2022 · Nature Communications

DOI:https://doi.org/10.1038/s41467-022-28583-3· OSTI ID:1846219

; Walmsley, P.; ; Sorensen, M. E.; ; Burns, D. H.;

Abstract

Strong electronic nematic fluctuations have been discovered near optimal doping for several families of Fe-based superconductors, motivating the search for a possible link between these fluctuations, nematic quantum criticality, and high temperature superconductivity. Here we probe a key prediction of quantum criticality, namely power-law dependence of the associated nematic susceptibility as a function of composition and temperature approaching the compositionally tuned putative quantum critical point. To probe the ‘bare’ quantum critical point requires suppression of the superconducting state, which we achieve by using large magnetic fields, up to 45 T, while performing elastoresistivity measurements to follow the nematic susceptibility. We performed these measurements for the prototypical electron-doped pnictide, Ba(Fe _{1− x} Co _x ) ₂ As ₂ , over a dense comb of dopings. We find that close to the putative quantum critical point, the elastoresistivity appears to obey power-law behavior as a function of composition over almost a decade of variation in composition. Paradoxically, however, we also find that the temperature dependence for compositions close to the critical value cannot be described by a single power law.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States). National High Magnetic Field Lab. (MagLab); Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)

Sponsoring Organization:: National Science Foundation (NSF); USDOE; USDOE Office of Science (SC), Basic Energy Sciences (BES)

Grant/Contract Number:: 89233218CNA000001; AC02-76SF00515

OSTI ID:: 1846219

Alternate ID(s):: OSTI ID: 1842321
OSTI ID: 1865038

Report Number(s):: LA-UR-22-20372; 1011; PII: 28583

Journal Information:: Nature Communications, Journal Name: Nature Communications Journal Issue: 1 Vol. 13; ISSN 2041-1723

Publisher:: Nature Publishing GroupCopyright Statement

Country of Publication:: United Kingdom

Language:: English

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