NonOhmic Conduction as a Probe of Coexisting Phases in Manganites

Details NonOhmic Conduction as a Probe of Coexisting Phases in Manganites NonOhmic Conduction as a Probe of Coexisting Phases in Manganites

2011-11-11

arxiv.org/abs/1111.2772v1

Physics

Condensed Matter

Disordered Systems and Neural Networks

Scientific paper

A new scaling formalism is used to analyze nonlinear \textit{I-V} data in the vicinity of metal-insulator transitions (MIT) in five manganite systems. An exponent, called nonlinearity exponent, and an onset field for nonlinearity, both characteristic of the system under study, are obtained from the analysis. The onset field is found to have an anomalously low value corroborating the theoretically predicted electronically soft phases. The scaling functions above and below the MIT of a polycrystalline sample are found to be same but with different exponents which are attributed to the distribution of the MIT temperatures. The existence of field scales in manganites underlines the universality of the assumed scaling form in disordered systems.

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