Disorder dependence of the ferromagnetic quantum phase transition.
Disorder dependence of the ferromagnetic quantum phase transition.
复制标题
铁磁量子相变的无序依赖性。
DOI：
10.1103/physrevlett.113.207201
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发表时间：
2014
影响因子：
8.6
通讯作者：
T. R. Kirkpatrick
中科院分区：
文献类型：
--
作者：
Y. Sang;D. Belitz;T. R. Kirkpatrick
我们定量地讨论了淬火无序对金属铁磁量子相变的影响，使用的理论，描述了耦合的磁化无隙费米激发。在洁净系统中，相变在三临界温度T_{tc}以下为一级相变。对于典型的量子铁磁体，当剩余磁电阻ρ 0为几μΩ cm量级时，猝灭无序将抑制T_{tc}直至T_{tc}消失.我们讨论的实验，使我们能够区分考虑从其他可能实现的一阶过渡的机制。
We quantitatively discuss the influence of quenched disorder on the ferromagnetic quantum phase transition in metals, using a theory that describes the coupling of the magnetization to gapless fermionic excitations. In clean systems, the transition is first order below a tricritical temperature T_{tc}. Quenched disorder is predicted to suppress T_{tc} until it vanishes for residual resistivities ρ_{0} on the order of several μΩ cm for typical quantum ferromagnets. We discuss experiments that allow us to distinguish the mechanism considered from other possible realizations of a first-order transition.