Local structure, transport, and rare-earth magnetism in the ferrimagnetic perovskite Gd{sub 0.67}Ca{sub 0.33}MnO{sub 3}
Journal Article
·
· Physical Review, B: Condensed Matter
- Department of Applied Physics, Stanford University, Stanford, California 94305-4090 (United States)
- Department of Physics, University of California Santa Cruz, Santa Cruz, California 95064 (United States)
- Hewlett-Packard, Palo Alto, California 94303-0867 (United States)
Bulk, single crystal, and metal-organic chemical-vapor deposition thin-film samples of Gd{sub 0.67}Ca{sub 0.33}MnO{sub 3} were prepared and examined for their electrical, magnetic, and structural properties. Gd{sub 0.67}Ca{sub 0.33}MnO{sub 3} is ferrimagnetic with a transition temperature between 50 and 80 K and a compensation temperature of about 15 K. A molecular field model with a ferromagnetic manganese sublattice antiparallel to the gadolinium sublattice qualitatively explains the magnetism data. A large high-field susceptibility is observed at 5 K, suggesting a sublattice rotation. The resistivity and the magnetoresistance show no anomaly near the ferrimagnetic transition. There is no noticeable change in the structure, as seen from the x-ray-absorption fine structure between 40 and 69 K, indicating that there is no structural discontinuity across the paramagnetic insulator to ferromagnetic insulator phase boundary. The resistivity of Gd{sub 0.67}Ca{sub 0.33}MnO{sub 3} is consistent with small polaron hopping at high temperatures (up to 1100 K), and possibly by a different mechanism at low temperatures. {copyright} {ital 1997} {ital The American Physical Society}
- OSTI ID:
- 505611
- Journal Information:
- Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 10 Vol. 55; ISSN PRBMDO; ISSN 0163-1829
- Country of Publication:
- United States
- Language:
- English
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