Colossal Effects in Transition Metal Oxides Caused by Intrinsic Inhomogeneities

Details Colossal Effects in Transition Metal Oxides Caused by Intrinsic Inhomogeneities Colossal Effects in Transition Metal Oxides Caused by Intrinsic Inhomogeneities

2001-07-13

arxiv.org/abs/cond-mat/0107300v2

Phys. Rev. Lett. 87, 277202 (2001)

Physics

Condensed Matter

Strongly Correlated Electrons

4 pages, 4 figures

Scientific paper

10.1103/PhysRevLett.87.277202

The influence of quenched disorder on the competition between ordered states separated by a first-order 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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