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Candidate Elastic Quantum Critical Point in LaCu_{6-x}Au_{x}.

L Poudel1,2, A F May3, M R Koehler4

  • 1Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA.

Physical Review Letters
|December 17, 2016
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Summary
This summary is machine-generated.

The study investigates LaCu_{6-x}Au_{x} materials, finding that gold substitution suppresses structural phase transitions. An elastic quantum critical point is identified at a critical gold concentration, indicating residual structural instability.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Crystallography

Background:

  • LaCu6 exhibits a continuous orthorhombic-monoclinic structural phase transition.
  • Tuning material properties via chemical substitution is a key area in materials science.

Purpose of the Study:

  • To investigate the impact of gold (Au) substitution on the structural properties of LaCu6.
  • To determine the critical composition (xc) at which the structural phase transition is suppressed.
  • To explore the nature of residual structural instability near the critical composition.

Main Methods:

  • Neutron diffraction and X-ray diffraction were employed to analyze structural changes.
  • Heat capacity measurements were conducted to probe thermodynamic properties and phase transitions.
  • Density functional theory (DFT) calculations were used to investigate electronic structure and coupling effects.

Main Results:

  • The orthorhombic-monoclinic structural phase transition in LaCu6 is suppressed linearly with increasing Au content.
  • Complete suppression of the structural phase transition occurs at a critical composition xc = 0.3.
  • Low-temperature heat capacity measurements reveal residual structural instability at xc, identified as ferroelastic in nature.
  • DFT calculations indicate negligible coupling between this instability and electronic states near the Fermi level.

Conclusions:

  • The LaCu_{6-x}Au_{x} system exhibits a continuous structural phase transition that terminates at finite gold concentration.
  • The observed ferroelastic instability suggests the presence of an elastic quantum critical point (QCP) in this series.
  • The findings are consistent with a zero-temperature termination of the structural phase transition, characteristic of a QCP.