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Metallic quantum ferromagnets

Accepted version
Peer-reviewed

Repository DOI


Type

Article

Change log

Authors

Brando, M 
Belitz, D 
Grosche, FM 
Kirkpatrick, TR 

Abstract

An overview of quantum phase transitions (QPTs) in metallic ferromagnets, discussing both experimental and theoretical aspects, is given. These QPTs can be classified with respect to the presence and strength of quenched disorder: Clean systems generically show a discontinuous, or first-order, QPT from a ferromagnetic to a paramagnetic state as a function of some control parameter, as predicted by theory. Disordered systems are much more complicated, depending on the disorder strength and the distance from the QPT. In many disordered materials the QPT is continuous, or second order, and Griffiths-phase effects coexist with QPT singularities near the transition. In other systems the transition from the ferromagnetic state at low temperatures is to a different type of long-range order, such as an antiferromagnetic or a spin-density-wave state. In still other materials a transition to a state with glasslike spin dynamics is suspected. The review provides a comprehensive discussion of the current understanding of these various transitions and of the relation between experiment and theory.

Description

Keywords

cond-mat.str-el, cond-mat.str-el

Journal Title

Reviews of Modern Physics

Conference Name

Journal ISSN

0034-6861
1539-0756

Volume Title

88

Publisher

American Physical Society (APS)
Sponsorship
Engineering and Physical Sciences Research Council (EP/K012894/1)
This work has been supported by the National Science Foundation under grant numbers NSF DMR-09-29966, DMR-09-01907, DMR-1401410, and DMR-1401449, and by the Deutsche Forschungsgemeinschaft under grant number FOR-960. Part of this work has been supported by the National Science Foundation under Grant. No. PHYS-1066293 and the hospitality of the Aspen Center for Physics.