Magnetotransport and hysteretic behavior in epitaxial La{sub 0.67}Ca{sub 0.33}MnO{sub 3{minus}{delta}} films
- Department of Physics, Brown University, Providence, Rhode Island 02912 (United States)
- IBM Research Division, Yorktown Heights, New York 10598 (United States)
We have fabricated epitaxial La{sub 0.67}Ca{sub 0.33}MnO{sub 3{minus}{delta}} thin films using pulsed laser deposition and performed subsequent thermal treatments. Magnetoresistance values as large as 14000{percent} ({Delta}{rho}/{rho}{sub {ital H}}) were obtained. Above magnetic ordering temperatures, we observed a thermally activated conductivity that also has a quadratic magnetic field dependence. At low temperatures, we found a large hysteresis in the magnetoresistance that correlates with an unusual magnetic hysteresis curve. We interpret the hysteretic behavior as the result of a {open_quote}{open_quote}frozen-in{close_quote}{close_quote} canted spin structure. Our results suggest that the electron conduction in this material is most sensitive to the canting angle of the neighboring Mn spins. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 279991
- Report Number(s):
- CONF-951101-; ISSN 0021-8979; TRN: 96:018929
- Journal Information:
- Journal of Applied Physics, Vol. 79, 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
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