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.affiliation: Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA.|Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: L
authors.initials: L
authors.lastname: Poudel
authors.affiliation: Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: A F
authors.initials: AF
authors.lastname: May
authors.affiliation: Department of Material Science & Engineering, University of Tennessee, Knoxville, Tennessee 37966, USA.
authors.forename: M R
authors.initials: MR
authors.lastname: Koehler
authors.affiliation: Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: M A
authors.initials: MA
authors.lastname: McGuire
authors.affiliation: Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: S
authors.initials: S
authors.lastname: Mukhopadhyay
authors.affiliation: Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: S
authors.initials: S
authors.lastname: Calder
authors.affiliation: National High Magnetic Field Laboratory, Florida State University, Tallahassee, Florida 32306, USA.
authors.forename: R E
authors.initials: RE
authors.lastname: Baumbach
authors.affiliation: Department of Material Science & Engineering, University of Tennessee, Knoxville, Tennessee 37966, USA.
authors.forename: R
authors.initials: R
authors.lastname: Mukherjee
authors.affiliation: Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA.
authors.forename: D
authors.initials: D
authors.lastname: Sapkota
authors.affiliation: Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: C
authors.initials: C
authors.lastname: de la Cruz
authors.affiliation: Department of Physics & Astronomy, University of Missouri, Columbia, Missouri 65211, USA.
authors.forename: D J
authors.initials: DJ
authors.lastname: Singh
authors.affiliation: Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA.|Materials Science & Technology Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.|Department of Material Science & Engineering, University of Tennessee, Knoxville, Tennessee 37966, USA.
authors.forename: D
authors.initials: D
authors.lastname: Mandrus
authors.affiliation: Department of Physics & Astronomy, University of Tennessee, Knoxville, Tennessee 37966, USA.|Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
authors.forename: A D
authors.initials: AD
authors.lastname: Christianson