标题： 一种脏铁磁体的复制斯通纳理论 显示英文标题

标题： A Replica Stoner Theory for Dirty Ferromagnets

摘要： 本文研究了无序对具有排斥相互作用的铁磁金属的影响。 我们假设在清洁极限下，铁磁态可以用Stoner平均场理论来描述，并通过结合复本+Stoner平均场的方法来研究无序如何影响该系统。 在零温度下，我们发现存在一种复本对称的铁磁平均场解，在无序存在的情况下，其Stoner准则被修改，其中铁磁性被无序增强。 在有限温度下，采用Landau理论构建相图，揭示出在临界无序强度以上，高温顺磁相和低温铁磁相之间可能存在自旋玻璃相。 对于弱（排斥）相互作用的情况，系统在清洁极限下是非铁磁性的，在零温度和有限温度下都观察到了无序诱导的铁磁基态的可能性。 简要讨论了该框架在实际材料中的潜在适用性。 显示英文摘要

摘要： This paper investigates the effect of disorder on a ferromagnetic metal with repulsive interactions. We assume that, in the clean limit, the ferromagnetic state can be described by Stoner mean-field theory and study how disorder affects the the system by using a combined replica + Stoner mean-field approach. At zero temperature, we find that a replica-symmetric ferromagnetic mean-field solution exists in the presence of disorder with a modified Stoner criteria where the ferromagnetism is enhanced by disorder. At finite temperature, a Landau theory is employed to construct the phase diagram, revealing that beyond a critical disorder strength, a spin-glass phase may exist between the high-temperature paramagnetic phase and the low-temperature ferromagnetic phase. For weak (repulsive) interaction where the system is non-ferromagnetic in the clean limit, the possibility of a disordered-induced ferromagnetic ground state is observed both at zero temperature and finite temperature. The potential applicability of this framework to realistic materials is briefly discussed.