CeCu6-xAux中的磁性和结构量子相变是独立的
Magnetic and structural quantum phase transitions in CeCu6-xAux are independent
摘要：
重费米子化合物CeCu $_{6-x}$ Au $_x$已成为非常规磁量子临界的模型系统。对于小的Au浓度$0 \leq x < 0.16$，化合物在温度$T_{s}$下经历从正交到单斜晶体对称的结构转变，对于$x \approx 0.15$具有$T_{s} \rightarrow 0$。反铁磁有序集接近于$x \approx 0.1$。为了阐明量子临界磁场和结构涨落之间的相互作用，我们对含有$0 \leq x\leq 0.3$的样品进行了中子散射和热力学测量。结果表明，在$x\approx 0.1$和$0.15$之间的微小Au浓度范围内，反铁磁相和单斜相共存。流体静力学和化学压力的应用允许清楚地分离的过渡彼此，并探讨磁量子临界行为的结构转变的可能影响。我们的测量表明，在低温下，非常规的量子临界性只产生于磁涨落，而不受单斜畸变的影响。
英文摘要：
The heavy-fermion compound CeCu$_{6-x}$Au$_x$ has become a model system for unconventional magnetic quantum criticality. For small Au concentrations $0 \leq x < 0.16$, the compound undergoes a structural transition from orthorhombic to monoclinic crystal symmetry at a temperature $T_{s}$ with $T_{s} \rightarrow 0$ for $x \approx 0.15$. Antiferromagnetic order sets in close to $x \approx 0.1$. To shed light on the interplay between quantum critical magnetic and structural fluctuations we performed neutron-scattering and thermodynamic measurements on samples with $0 \leq x\leq 0.3$. The resulting phase diagram shows that the antiferromagnetic and monoclinic phase coexist in a tiny Au concentration range between $x\approx 0.1$ and $0.15$. The application of hydrostatic and chemical pressure allows to clearly separate the transitions from each other and to explore a possible effect of the structural transition on the magnetic quantum critical behavior. Our measurements demonstrate that at low temperatures the unconventional quantum criticality exclusively arises from magnetic fluctuations and is not affected by the monoclinic distortion.
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