Magnetic field induced properties of manganite perovskites with colossal magnetoresistance (invited)
- Department of Physics, Brown University, Providence, Rhode Island 02912 (United States)
- Francis Bitter National Magnet Laboratory, Massachusetts Institute of Technology, Cambridge, Massachusetts 02139 (United States)
- IBM T. J. Watson Research Center, Yorktown Heights, New York 10598 (United States)
We present a systematic study of the magnetotransport and magnetic properties of the half-doped La{sub 0.5}Ca{sub 0.5}MnO{sub 3+{delta}} system. The solid is a metamagnet which undergoes a first-order antiferromagnet (AFM) to ferromagnet (FM) phase transition under a field or by changing temperature. Associated with the AFM{endash}FM transition is an insulator to metal transition. A maximum 10{sup 9}-fold magnetoresistance ratio has been observed at 4.2 K between the least and the most conductive states. At low T ({le}50 K), we have also observed two additional metastable electronic states in the canted AFM state at certain fields. The resistivity of each state differs from one another by at least one order of magnitude. The existence of these multiple states may be related to the unique charge- and spin-ordered state of the half-doped manganite. {copyright} {ital 1997 American Institute of Physics.}
- OSTI ID:
- 496580
- 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
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