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Percolative transitions with first-order characteristics in the context of colossal magnetoresistance manganites

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Mayr,  M.
Department Quantum Many-Body Theory (Walter Metzner), Max Planck Institute for Solid State Research, Max Planck Society;

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Citation

Burgy, J., Dagotto, E., & Mayr, M. (2003). Percolative transitions with first-order characteristics in the context of colossal magnetoresistance manganites. Physical Review B, 67(1): 014410.


Cite as: https://hdl.handle.net/21.11116/0000-000E-F8D3-C
Abstract
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.