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Giant magnetoresistance in layered Mn oxides

โœ Scribed by J. Inoue; S. Maekawa

Book ID
103954568
Publisher
Elsevier Science
Year
1995
Tongue
English
Weight
441 KB
Volume
31
Category
Article
ISSN
0921-5107

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โœฆ Synopsis

The magnetic phase diagram and giant magnetoresistance in perovskite (La-X)MnO 3 with X = Ba, Ca or Sr are studied by using a model where t2g and eg electrons of Mn ions are treated as localized spins and strongly correlated itinerant electrons, respectively, and a Hund coupling exists between them. It is shown in a mean field approximation that the antiferromagnetism of LaMnO 3 changes to a spiral state, not the canted state proposed before, by doping of mobile carriers. Giant magnetoresistance is studied in a strong coupling limit of the model. The strong Hund coupling is shown to account for a strong dependence of the resistivity on the magnetization induced by an external magnetic field in agreement with experimental results.

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