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Title: Candidate Elastic Quantum Critical Point in LaCu 6 - x Au x

Abstract

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 LaCu 6 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.

Authors:
; ; ; ; ; ; ; ; ; ; ; ;
Publication Date:
Research Org.:
Argonne National Lab. (ANL), Argonne, IL (United States). Advanced Photon Source (APS)
Sponsoring Org.:
USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22); USDOE National Nuclear Security Administration (NNSA)
OSTI Identifier:
1334805
Resource Type:
Journal Article
Journal Name:
Physical Review Letters
Additional Journal Information:
Journal Volume: 117; Journal Issue: 23; Journal ID: ISSN 0031-9007
Publisher:
American Physical Society (APS)
Country of Publication:
United States
Language:
ENGLISH
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS

Citation Formats

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., and Christianson, A. D. Candidate Elastic Quantum Critical Point in LaCu6-xAux. United States: N. p., 2016. Web. doi:10.1103/PhysRevLett.117.235701.
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. Candidate Elastic Quantum Critical Point in LaCu6-xAux. United States. doi:10.1103/PhysRevLett.117.235701.
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., and Christianson, A. D. Tue . "Candidate Elastic Quantum Critical Point in LaCu6-xAux". United States. doi:10.1103/PhysRevLett.117.235701.
@article{osti_1334805,
title = {Candidate Elastic Quantum Critical Point in LaCu6-xAux},
author = {Poudel, L. and May, A. F. and Koehler, M. R. and McGuire, M. A. and Mukhopadhyay, S. and Calder, S. and Baumbach, R. E. and Mukherjee, R. and Sapkota, D. and de la Cruz, C. and Singh, D. J. and Mandrus, D. and Christianson, A. D.},
abstractNote = {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 LaCu 6 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.},
doi = {10.1103/PhysRevLett.117.235701},
journal = {Physical Review Letters},
issn = {0031-9007},
number = 23,
volume = 117,
place = {United States},
year = {2016},
month = {11}
}

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    Works referencing / citing this record:

    Evidence of a structural quantum critical point in ( Ca x Sr 1 − x ) 3 Rh 4 Sn 13 from a lattice dynamics study
    journal, October 2018