Anomalous Hall effect of calcium-doped lanthanum cobaltite films

The Hall resistivity, magnetoresistance, and magnetization of La1−xCaxCoO3 epitaxial films with 0.25⩾x⩾0.4 grown on lanthanum aluminate were measured in fields up to 7 T. The x=1/3 film shows a reentrant metal insulator transition. Below 100 K, the x=1/3 and 0.4 films have significant coercivity whi...

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Veröffentlicht in:Journal of applied physics 2003-05, Vol.93 (10), p.8316-8318
Hauptverfasser: Baily, S. A., Salamon, M. B.
Format: Artikel
Sprache:eng
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Zusammenfassung:The Hall resistivity, magnetoresistance, and magnetization of La1−xCaxCoO3 epitaxial films with 0.25⩾x⩾0.4 grown on lanthanum aluminate were measured in fields up to 7 T. The x=1/3 film shows a reentrant metal insulator transition. Below 100 K, the x=1/3 and 0.4 films have significant coercivity which increases with decreasing temperature. At low temperature the Hall resistivity remains large and essentially field independent in these films, except for a sign change at the coercive field that is more abrupt than the switching of the magnetization. A unique magnetoresistance behavior accompanies this effect. These results are discussed in terms of a percolation picture and the mixed spin state model for this system. We propose that the low-temperature Hall effect is caused by spin-polarized carriers scattering off of orbital disorder in the spin-ordered clusters.
ISSN:0021-8979
1089-7550
DOI:10.1063/1.1540183