寻找YbCu5-xAux中的量子临界点
Searching for a quantum critical point in YbCu5-xAux
摘要：
本文报道了Au浓度在AuBe_5型结构稳定极限（x = 0.4 ~ 0.7）之间的YbCu_（5-x）Aux合金的结构、磁性、输运和热性质。该系统的突出特点是：i）在特征温度T* 以下（范围在150 mK和350 mK之间），Cm /T 7 J/molK^2的值是恒定的，并且是创纪录的高值。ii）幂律热依赖关系Cm/T（T>T*）=A/T^q，其中q = 1.3 +/-0.1，以及iii）尽管Yb磁性原子被放置在晶格中，但在T <1 K（x < 0.6）下在电阻率中观察到出现的非相干电子散射。磁阻挫，起源于Yb原子的四面体分布，似乎是负责该系统的奇异行为。
英文摘要：
Structural, magnetic, transport and thermal properties of YbCu5-xAux alloys with Au concentration between the limit of structural stability of AuBe5 type at x = 0.4 up to x = 0.7 are reported. The outstanding features of this system are: i) the constant and record high values of Cm /T 7J/molK^2 below a characteristic temperature T*, ranging between 150 mK and 350 mK. ii) A power law thermal dependence dependence Cm/T(T>T*)=A/T^q, with q = 1.3 +/- 0.1, and iii) an arising incoherent electronic scattering observed in the resistivity at T < 1K for x < 0.6 despite the fact that Yb magnetic atoms are placed in a lattice. Magnetic frustration, originated in the tetrahedral distribution of Yb atoms, appears as the responsible of the exotic behavior of this system.
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