LaCu $_{6-x}$ Au $_x$中的候选弹性量子临界点
Candidate Elastic Quantum Critical Point in LaCu$_{6-x}$Au$_x$
摘要：
用中子衍射、X射线衍射和热容测量研究了LaCu $_{6-x}$ Au $_x$的结构性质。在LaCu $_{6}$中连续的正交-单斜结构相变被Au取代线性抑制，直到在临界组成$x_{c}$ = 0.3处发生结构相变的完全抑制。在低温下的热容量测量表明，在$x_c$的残余结构的不稳定性，以及延伸到正交相。这种不稳定性本质上是铁弹性的，密度泛函理论（DFT）计算显示费米能级附近的电子态耦合可以忽略不计。这里提出的数据和计算是一致的零温度终止的连续结构相变表明，LaCu $_{6-x}$金$_x$系列主机的弹性量子临界点。
英文摘要：
The structural properties of LaCu$_{6-x}$Au$_x$ have been 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 $x_c$ that extends well into the orthorhombic phase. The instability is ferroelastic in nature, with density functional theory (DFT) 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.
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