Colossal magnetoresistance in the antiferromagnetic La{sub 0.5}Ca{sub 0.5}MnO{sub 3} system
- Physics Department, Brown University, Providence, Rhode Island 02912 (United States)
- IBM Research Division, Yorktown Heights, New York 10598 (United States)
We have explored the colossal magnetoresistance (CMR) effect in the antiferromagnetic La{sub 0.5}Ca{sub 0.5}MnO{sub 3} compound. In the absence of a magnetic field ({ital H}), the solid is a canted antiferromagnetic (AFM) insulator. An applied {ital H} in the Tesla scale induces a first order AFM to FM phase transition, and correspondingly, an insulator to metal transition. The observed CMR is attributed to the {ital H}-induced charge localization-delocalization behavior associated with the AFM{endash}FM transition. At low temperatures ({ital T}{lt}100 K), the solid remains in the AFM phase, where we have observed a phenomenal one millionfold change in resistivity between 0 and 8 Tesla. The origin of CMR in low {ital T}-region is a thermal activation energy gap which is strongly dependent on {ital H}. {copyright} {ital 1996 American Institute of Physics.}
- OSTI ID:
- 279987
- Report Number(s):
- CONF-951101--
- Journal Information:
- Journal of Applied Physics, Journal Name: Journal of Applied Physics Journal Issue: 8 Vol. 79; ISSN JAPIAU; ISSN 0021-8979
- Country of Publication:
- United States
- Language:
- English
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