This article is cited in 5 papers

Semiconductors

Anomalous influence of an external magnetic field on spin fluctuations in magnetic semiconductors with strong $p$–$d$ hybridization and the colossal magnetoresistance effect

A. G. Volkov, A. A. Povzner

Ural Federal University named after the First President of Russia B. N. Yeltsin, Ekaterinburg

Abstract: The colossal magnetoresistance effect in magnetic semiconductors based on lanthanum manganites has been investigated in terms of the model allowing for the effects of $p$–$d$ hybridization and electronelectron Coulomb correlations. The influence of an external magnetic field on spin fluctuations has been considered under the conditions where the chemical potential is in a narrow heavy-fermion band formed in the hybridization gap. It has been shown that, in the vicinity of the Curie point $T_C$, the strong spin anharmonicity leads to an anomalously strong suppression of spin fluctuations by the external magnetic field, a phenomenon contributing significantly to the formation of colossal negative magnetoresistance.

Received: 30.01.2012
Accepted: 26.04.2012

 English version: Physics of the Solid State, 2012, 54:12, 2351–2356

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