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The structural properties of LaCu$_{6-x}$Au$_x$ have been studied usingneutron diffraction, x-ray diffraction, and heat capacity measurements. Thecontinuous orthorhombic-monoclinic structural phase transition in LaCu$_{6}$ issuppressed linearly with Au substitution until a complete suppression of thestructural phase transition occurs at the critical composition, $x_{c}$ = 0.3.Heat capacity measurements at low temperatures indicate residual structuralinstability at $x_c$ that extends well into the orthorhombic phase. Theinstability is ferroelastic in nature, with density functional theory (DFT)calculations showing negligible coupling to electronic states near the Fermilevel. The data and calculations presented here are consistent with the zerotemperature termination of a continuous structural phase transition suggestingthat the LaCu$_{6-x}$Au$_x$ series hosts an elastic quantum critical point.

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