|
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.}
|
| Authors: |
De Teresa, J.M.;
Blasco, J.;
Ibarra, M.R.;
Garcia, J.;
Marquina, C.;
Algarabel, P.;
del Moral, A. [Departamento de Fisica de la Materia Condensada e Instituto de Ciencia de Materiales de Aragon, Universidad de Zaragoza-CSIC, 50009-Zaragoza (Spain)]
|
| Publication Date: | 1996 Apr 01 |
|---|
| OSTI Identifier: | 280038 |
|---|
| Report Number(s): | CONF-951101-- |
|---|
| Resource Type: | Journal Article |
|---|
| Resource Relation: | Journal Name: Journal of Applied Physics; Journal Volume: 79; Journal 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 |
|---|
| Format: | Size: pp. 5175-5177 |
|---|
| Other Number(s): | Journal ID: JAPIAU; ISSN 0021-8979; TRN: 9608M0092 |
|---|
| Subject: | 36 MATERIALS SCIENCE; LANTHANUM OXIDES; MAGNETORESISTANCE; TERBIUM OXIDES; YTTRIUM OXIDES; CALCIUM OXIDES; MANGANESE OXIDES; CERAMICS; MAGNETIC MATERIALS; MAGNETOSTRICTION; ELECTRONIC STRUCTURE; TEMPERATURE DEPENDENCE; TEMPERATURE RANGE 0065-0273 K |
|---|
| Update Date: | 2009 Dec 16 |
|---|
Top |
|
