LaCu6-xAgx: A promising host of an elastic quantum critical point

Poudel, Lekh; Dela Cruz, Clarina R.; Koehler, Michael R.; McGuire, Michael A.; Keppens, Veerle; Mandrus, David; Christianson, Andrew D.

doi:10.1016/j.physb.2017.08.066

Title: LaCu_6-xAg_x: A promising host of an elastic quantum critical point

Conference · Tue May 01 00:00:00 EDT 2018 · Physica. B, Condensed Matter

DOI:https://doi.org/10.1016/j.physb.2017.08.066· OSTI ID:1435319

^[1];

^[1]; Koehler, Michael R. ^[2];

^[1]; Keppens, Veerle ^[2]; Mandrus, David ^[1];

^[1]

ORNL
University of Tennessee, Knoxville (UTK)

Structural properties of LaCu_6-xAg_x have been investigated using neutron and x-ray diffraction, and resonant ultrasound spectroscopy (RUS) measurements. Diffraction measurements indicate a continuous structural transition from orthorhombic (Pnma) to monoclinic (P2₁/C) structure. RUS measurements show softening of natural frequencies at the structural transition, consistent with the elastic nature of the structural ground state. The structural transition temperatures in LaCu_6-xAg_x decrease with Ag composition until the monoclinic phase is completely suppressed at x_c=0.225. All of the evidence is consistent with the presence of an elastic quantum critical point in LaCu_6-xAg_x.

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Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States)

Sponsoring Organization:: USDOE

DOE Contract Number:: AC05-00OR22725

OSTI ID:: 1435319

Journal Information:: Physica. B, Condensed Matter, Vol. 536, Issue none; Conference: International Conference on Strongly Correlated Electron Systems (SCES 2017), Prague, Czech Republic, 7/17/2017 4:00:00 AM-7/21/2017 4:00:00 AM; ISSN 0921-4526

Publisher:: Elsevier

Country of Publication:: United States

Language:: English

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Title: LaCu_6-xAg_x: A promising host of an elastic quantum critical point