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          Institute: MPI für Festkörperforschung     Collection: FKF Publikationen 2003     Display Documents



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ID: 6999.0, MPI für Festkörperforschung / FKF Publikationen 2003
Percolative transitions with first-order characteristics in the context of colossal magnetoresistance manganites
Authors:Burgy, J.; Dagotto, E.; Mayr, M.
Language:English
Date of Publication (YYYY-MM-DD):2003
Title of Journal:Physical Review B
Volume:67
Issue / Number:1
Sequence Number of Article:014410
Review Status:Peer-review
Audience:Not Specified
Abstract / Description:The unusual magnetotransport properties of manganites are
widely believed to be caused by mixed-phase tendencies and
concomitant percolative processes. However, dramatic deviations
from "standard" percolation have been unveiled experimentally.
Here, a semiphenomenological description of Mn oxides is
proposed based on coexisting clusters with smooth surfaces, as
suggested by Monte Carlo simulations of realistic models for
manganites, also briefly discussed here. The present approach
produces fairly abrupt percolative transitions and even first-
order discontinuities, in agreement with experiments. These
transitions may describe the percolation that occurs after
magnetic fields align the randomly oriented ferromagnetic
clusters believed to exist above the Curie temperature in Mn
oxides. In this respect, part of the manganite phenomenology
could belong to a new class of percolative processes triggered
by phase competition and correlations.
External Publication Status:published
Document Type:Article
Communicated by:Michaela Asen-Palmer
Affiliations:MPI für Festkörperforschung
External Affiliations:; Florida State Univ, Natl High Magnet Field Lab, Tallahassee, FL 32306 USA
; Florida State Univ, Dept Phys, Tallahassee, FL 32306 USA
; Max Planck Inst Festkorperforsch, D-70569 Stuttgart, Germany
Identifiers:ISI:000180830400055
ISSN:1098-0121
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