Reviews of topical problems

Lanthanum manganites and other giant-magnetoresistance magnetic conductors

Institute for High Pressure Physics, Russian Academy of Sciences, Troitsk, Moscow, Russian Federation

A review is given of crystallographic, magnetic and electric properties of lanthanum manganites and related materials with a giant magnetoresistance (GMR). An analysis of experimental data for partially substituted manganites shows that if the spontaneous magnetic moment is unsaturated, the material is being in a phase-separated ferro-antiferromagnetic state. One possible GMR mechanism consists in a change of such a state under the magnetic field. If the magnetic moment of these materials is saturated, they display a resistivity peak in the vicinity of the Curie point. It is caused by the interaction of the charge carriers with spatial fluctuations of the electric potential and local magnetization. Suppression of this peak by the magnetic field leads to a GMR in ferromagnetic conductors.

Fulltext is available at IOP
PACS: 75.90.+w
DOI: 10.1070/PU1996v039n08ABEH000161
Citation: Nagaev E L "Lanthanum manganites and other giant-magnetoresistance magnetic conductors" Phys. Usp. 39 781–805 (1996)
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Оригинал: Нагаев Э Л «Манганиты лантана и другие магнитные проводники с гигантским магнитосопротивлением» УФН 166 833–858 (1996); DOI: 10.3367/UFNr.0166.199608b.0833

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