Thermal expansion and magnetostriction in colossal magnetoresistance mixed valence manganites (abstract)
- Departamento de Fisica de la Materia Condensada Instituto de Ciencia de Materiales de Aragon, Universidad de Zaragoza-Consejo Superior de Investigaciones Cientificas, 50009 Zaragoza (Spain)
Structural aspects are closely related to the large spontaneous and field-induced magnetic and magnetogalvanic effects in mixed valence manganites. Local distortions are the source of an extra contribution to the thermal expansion. These were associated with a charge localization process. The existence of ferromagnetic order in these compounds favors the carriers mobility and, as a consequence, produces unexpected magnetovolume effects. We report thermal expansion measurements within the temperature range 4{endash}800 K and magnetostriction up to 15 T in the series (R{sub 1{minus}y}R{sub y}){sub 1{minus}x}Ca{sub x}MnO{sub 3} (R=La, Nd and R{sup {prime}}=Y, Tb). We have found completely unusual volume magnetostriction at temperatures at which the system is in the insulator state (paramagnetic, antiferromagnetic, spin-glass states). These results give a deep insight into the mechanism responsible for the colossal magnetoresistance and reveal these experimental techniques as an excellent tool to follow the spontaneous and field-induced localization and delocalization processes. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 544302
- Report Number(s):
- CONF-961141-; ISSN 0021-8979; TRN: 97:019271
- Journal Information:
- Journal of Applied Physics, Vol. 81, Issue 8; Conference: 41. annual conference on magnetism and magnetic materials, Atlanta, GA (United States), 12-15 Nov 1996; Other Information: PBD: Apr 1997
- Country of Publication:
- United States
- Language:
- English
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