Lattice effects, stability under a high magnetic field, and magnetotransport properties of the charge-ordered mixed-valence La{sub 0.35}Ca{sub 0.65}MnO{sub 3} perovskite
- Departamento de Fisica de la Materia Condensada e Instituto de Ciencia de Materiales de Aragon, Universidad de Zaragoza y Consejo Superior de Investigaciones Cientificas, Facultad de Ciencias, 50009-Zaragoza (Spain)
- Institut Laue Langevin, B.P. 156, 38042 Grenoble Cedex 09 (France)
The highly Mn{sup +4}-doped compound La{sub 0.35}Ca{sub 0.65}MnO{sub 3} has been studied up to high temperature (700 K) by using thermal-expansion, magnetostriction, magnetoresistance, and neutron-diffraction techniques. From 700 K down to room temperature the electrical conduction takes place through thermally activated hopping of polarons with E{sub hop}=45 meV. At the charge-ordering (CO) transition temperature T{sub CO}=275 K, pronounced anomalies in the resistivity and the lattice are observed. The neutron thermodiffractogram clearly establishes that the CO state occurs in the paramagnetic (P) phase and is accompanied by a large anisotropic lattice distortion with a simultaneous large distortion of the MnO{sub 6} octahedra. The antiferromagnetic (AF) phase appears at T{sub N}=160{plus_minus}3 K. At this temperature no lattice effect is observed. The CO-P and the CO-AF ground states are stable under an applied magnetic field up to 12 T. thinsp {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 632608
- Journal Information:
- Physical Review, B: Condensed Matter, Vol. 56, Issue 13; Other Information: PBD: Oct 1997
- Country of Publication:
- United States
- Language:
- English
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Related Subjects
LANTHANUM OXIDES
ELECTRIC CONDUCTIVITY
MIXED STATE
MAGNETIC PROPERTIES
CALCIUM OXIDES
MANGANESE OXIDES
THERMAL EXPANSION
MAGNETORESISTANCE
NEUTRON DIFFRACTION
MAGNETOSTRICTION
VALENCE
STABILITY
CHARGED-PARTICLE TRANSPORT
PEROVSKITES
CRYSTAL DOPING
ANTIFERROMAGNETIC MATERIALS
GROUND STATES