Thermal expansion and magnetostriction in colossal magnetoresistance mixed valence manganites (abstract)

Journal Article · Tue Apr 01 04:00:00 EST 1997 · Journal of Applied Physics

DOI:https://doi.org/10.1063/1.364583· OSTI ID:544302

De Teresa, J M; Ibarra, M R; Algarabel, P A; Marquina, C; Blasco, J; Garcia, J; del Moral, A ^[1]

---

1. 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--
• Journal Information: Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 81; ISSN JAPIAU; ISSN 0021-8979
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
ANTIFERROMAGNETIC MATERIALS
CALCIUM COMPOUNDS
CARRIER MOBILITY
CRYSTAL STRUCTURE
FERROMAGNETIC MATERIALS
LANTHANUM OXIDES
MAGNETOSTRICTION
MANGANESE OXIDES
NEODYMIUM OXIDES
RARE EARTH COMPOUNDS
TERBIUM OXIDES
THERMAL EXPANSION
YTTRIUM OXIDES