%0 Journal Article
%A Burgy, J.
%A Mayr, M.
%A Martín Mayor, Víctor
%A Moreno, A.
%A Dagotto, E.
%T Colossal effects in transition metal oxides caused by intrinsic inhomogeneities
%D 2001
%@ 0031-9007
%U https://hdl.handle.net/20.500.14352/60323
%X The influence of quenched disorder on the competition between ordered states separated by a firstorder transition is investigated. A phase diagram with features resembling quantum-critical behavior is observed, even using classical models. The low-temperature paramagnetic regime consists of coexisting ordered clusters, with randomly oriented order parameters. Extended to manganites, this state is argued to have a colossal magnetoresistance effect. A scale T* for cluster formation is discussed. This is the analog of the Griffiths temperature, but for the case of two competing orders, producing a strong susceptibility to external fields. Cuprates may have similar features, compatible with the large proximity effect of the very underdoped regime.
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