Colossal Effects in Transition Metal Oxides Caused by Intrinsic Inhomogeneities

Abstract

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.

4 pages, 4 figures

References in corpus (2)

• Colossal Magnetoresistant Materials: The Key Role of Phase Separation
• Phase Separation and the Low-Field Bulk Magnetic Properties of Pr0.7Ca0.3MnO3

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