Influence of rare regions on magnetic quantum phase transitions

Preprint

31 August 1999

preprint
Published by arXiv in arXiv

https://doi.org/10.48550/arXiv.cond-mat/9903194

Abstract

The effects of quenched disorder on the critical properties of itinerant quantum magnets are considered. Particular attention is paid to locally ordered rare regions that are formed in the presence of quenched disorder even when the bulk system is still in the nonmagnetic phase. It is shown that these local moments or instantons destroy the previously found critical fixed point in the case of antiferromagnets. In the case of itinerant ferromagnets, the critical behavior is unaffected by the rare regions due to an effective long-range interaction between the order parameter fluctuations.

Keywords

QUENCHED DISORDER
PHASE TRANSITIONS
ANTIFERROMAGNETS
QUANTUM MAGNETS
QUANTUM PHASE
RARE REGIONS
FERROMAGNETS
ITINERANT
BEHAVIOR

All Related Versions

Version 1, 1999-03-11, ArXiv
Version 2, 1999-08-31, ArXiv
Version 1, 1999-07-25, ArXiv (Unconfirmed version)
Version 2, 1999-12-22, ArXiv (Unconfirmed version)
Published version: Physical Review Letters, 82 (25), 5132.

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