Candidate Elastic Quantum Critical Point in LaCu6-xAux

Poudel, L.; May, A. F.; Koehler, M. R.; McGuire, M. A.; Mukhopadhyay, S.; Calder, S.; Baumbach, R. E.; Mukherjee, R.; Sapkota, D.; de la Cruz, C.; Singh, D. J.; Mandrus, D.; Christianson, A. D.

doi:10.1103/PhysRevLett.117.235701

Title: Candidate Elastic Quantum Critical Point in ${LaCu}_{6 - x} {Au}_{x}$

Journal Article · Tue Nov 01 00:00:00 EDT 2016 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.117.235701· OSTI ID:1334805

Poudel, L.; May, A. F.; Koehler, M. R.; McGuire, M. A.; Mukhopadhyay, S.; Calder, S.; Baumbach, R. E.; Mukherjee, R.; Sapkota, D.; de la Cruz, C.; Singh, D. J.; Mandrus, D.; Christianson, A. D.

The structural properties of LaCu _6-x Au _x are studied using neutron diffraction, x-ray diffraction, and heat capacity measurements. The continuous orthorhombic-monoclinic structural phase transition in LaCu₆ is suppressed linearly with Au substitution until a complete suppression of the structural phase transition occurs at the critical composition x _c = 0.3 . Heat capacity measurements at low temperatures indicate residual structural instability at x_c . The instability is ferroelastic in nature, with density functional theory calculations showing negligible coupling to electronic states near the Fermi level. The data and calculations presented here are consistent with the zero temperature termination of a continuous structural phase transition suggesting that the LaCu _6-x Au _x series hosts an elastic quantum critical point.

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Research Organization:: Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE National Nuclear Security Administration (NNSA)

OSTI ID:: 1334805

Journal Information:: Physical Review Letters, Vol. 117, Issue 23; ISSN 0031-9007

Publisher:: American Physical Society (APS)

Country of Publication:: United States

Language:: ENGLISH

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