NiS $_{2}$黄铁矿反铁磁临界点的量子临界性和无序性
Quantum criticality and disorder in the antiferromagnetic critical point of NiS$_{2}$ pyrite
摘要：
反铁磁相和顺磁相之间的量子临界点（QCP）是通过对NiS_{2}黄铁矿单晶施加~ 7 GPa的静水压力来实现的，该黄铁矿具有低剩余电阻率，rho_{0}，为0.5 μ Ω-cm。我们发现，在这个干净的系统中的电阻率，ρ的临界行为，与观察到的在其无序的类似物，NiS_{2-x} Se_{x}固溶体形成鲜明对比，展示了出乎意料的急剧影响的量子临界的无序。在P = 9 GPa的整个顺磁区域内，交叉温度（定义为ρ的T^{2}依赖性的开始，费米液体的指示）被抑制到相当低的温度Tsim 2 K，相反，ρ的非费米液体行为，T^{3/2}依赖性，稳健地显示出来。
英文摘要：
A quantum critical point (QCP) between the antiferromagnetic and the paramagnetic phases was realized by applying a hydrostatic pressure of ~ 7 GPa on single crystals of NiS_{2} pyrite with a low residual resistivity, rho_{0}, of 0.5 mu-Omega-cm. We found that the critical behavior of the resistivity, rho, in this clean system contrasts sharply with those observed in its disordered analogue, NiS_{2-x}Se_{x} solid-solution, demonstrating the unexpectedly drastic effect of disorder on the quantum criticality. Over a whole paramagnetic region investigated up to P = 9 GPa, a crossover temperature, defined as the onset of T^{2} dependence of rho, an indication of Fermi liquid, was suppressed to a substantially low temperature T sim 2 K and, instead, a non Fermi liquid behavior of rho, T^{3/2}-dependence, robustly showed up.
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