LaCu $_{6-x}$ Ag $_{x}$：一种有希望的弹性量子临界点主体
LaCu$_{6-x}$Ag$_{x}$: A promising host of an elastic quantum critical point
摘要：
采用中子衍射、X射线衍射和共振超声谱（RUS）研究了LaCu $_{6-x}$ Ag $_{x}$的结构性质。衍射测量表明从正交（$Pnma$）到单斜（$P2_1/c$）结构的连续结构转变。RUS测量结果表明，结构过渡时固有频率软化，与结构基态的弹性性质一致。LaCu $_{6-x}$ Ag $_{x}$的结构转变温度随着Ag组分的增加而降低，直到单斜相被完全抑制在$x_c$ = 0.225。所有的证据都与LaCu $_{6-x}$ Ag $_{x}$中弹性量子临界点的存在相一致。
英文摘要：
Structural properties of LaCu$_{6-x}$Ag$_{x}$ 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 ($P2_1/c$) 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$_{6-x}$Ag$_{x}$ 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$_{6-x}$Ag$_{x}$.
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