Correlation between magnetovolume and giant magnetoresistance effects in doped La{sub 2/3}Ca{sub 1/3}MnO{sub 3} perovskites
- Departamento de Fisica de la Materia Condensada e Instituto de Ciencia de Materiales de Aragon, Universidad de Zaragoza-CSIC, 50009-Zaragoza (Spain)
La{sub 0.62}Tb{sub 0.05}Ca{sub 0.33}MnO{sub 3} and La{sub 0.6}Y{sub 0.07}Ca{sub 0.33}MnO{sub 3} have been studied in order to probe into the mechanisms responsible for the giant magnetoresistance ratios observed in this kind of compound. The experiments have shown a strong connection between the magnetotransport and magnetovolume properties. A large volume effect appears above {ital T}{sub {ital c}} which collapses with applied magnetic field or when the long range magnetic order sets in. Above {ital T}{sub {ital c}} the magnetostriction and magnetoresistance isotherms are highly correlated. Charge localization with local distortion appears to be responsible for the transport and volume properties at zero field. Charge mobility and a more normal volume dependence on temperature are restored by applying high enough magnetic fields. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 280038
- Report Number(s):
- CONF-951101-; ISSN 0021-8979; TRN: 9608M0092
- Journal Information:
- Journal of Applied Physics, Vol. 79, Issue 8; Conference: 40. conference on magnetism and magnetic materials, Philadelphia, PA (United States), 6-9 Nov 1995; Other Information: PBD: Apr 1996
- Country of Publication:
- United States
- Language:
- English
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