We study the temperature-magnetic field T-B phase diagrams of heavy-fermion (HF) metals, and show that at sufficiently high temperatures outside the ordered phase the crossover temperature T?(B), regarded as the energy scale, follows a linear B-dependence, crossing the origin of the T-B phase diagram. This behavior of T?(B) constitutes the general property, and is formed by the presence of the fermion condensation quantum phase transition hidden within the ordered phase. Our result is in good agreement with the experimental T-B phase diagram of the HF metals YbRh_2Si_2, Yb(Rh_(0.93)Co_(0.07))_2Si_2, and Yb(Rh_(0.94)Ir_(0.06))_2Si_2. To support our observations, we analyze the isothermal magnetization M, and demonstrate that dM/dT exhibits a universal temperature behavior over magnetic field scaling. The obtained results are in good agreement with the corresponding data collected on YbRh2Si2 as a function of the magnetic field at different temperatures under hydrostatic pressure.
展开▼
机译:我们研究了重金属(HF)的温度-磁场TB相图,并发现在有序相以外的足够高的温度下,被视为能级的交越温度T?(B)遵循线性B-依赖,跨越结核病相图的起源。 T 2(B)的这种行为构成一般性质,并且是由隐藏在有序相内的费米子缩合量子相变形成的。我们的结果与HF金属YbRh_2Si_2,Yb(Rh_(0.93)Co_(0.07))_ 2Si_2和Yb(Rh_(0.94)Ir_(0.06))_ 2Si_2的实验T-B相图非常吻合。为了支持我们的观察,我们分析了等温磁化强度M,并证明dM / dT在磁场标度上表现出普遍的温度行为。所获得的结果与在YbRh2Si2上收集的相应数据(在静水压力下不同温度下随磁场变化的函数)非常吻合。
展开▼