Disorder dependence of the ferromagnetic quantum phase transition
Abstract
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 Ttc. Quenched disorder is predicted to suppress Ttc until it vanishes for residual resistivities rho0 on the order of several microOhmcm for typical quantum ferromagnets. We discuss experiments that allow to distinguish the mechanism considered from other possible realizations of a first-order transition.
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