Electron spectroscopic studies of colossal magnetoresistance material La{sub 1{minus}{ital x}}Ca{sub {ital x}}MnO{sub 3}
- AT&T Bell Laboratories, Murray Hill, New Jersey 07974 (United States)
- Naval Research Laboratory, Code 6345, Washington, DC 20375 (United States)
High resolution photoemission measurements have been performed for the ferromagnetic transition of La{sub 0.67}Ca{sub 0.33}MnO{sub 3} and for the order{endash}disorder transition of La{sub 0.4}Ca{sub 0.6}MnO{sub 3}. The band gap collapsed below the Curie temperature and the density of states at the Fermi level increases with cooling. Upon cooling through the order{endash}disorder transition temperatures, {ital T}{sub CO}, the band gap increases by {approximately}50 meV. This change in the gap is consistent with the change in the activation energy above and below {ital T}{sub CO} estimated from conductivity data. We have also performed soft x-ray magnetic circular dichroism measurements at Mn {ital L}{sub 2,3} edges for ferromagnetic La{sub 0.67}Ca{sub 0.33}MnO{sub 3} and La{sub 0.8}Ca{sub 0.2}MnO{sub 3}. {copyright} {ital 1996 American Institute of Physics.}
- Research Organization:
- Brookhaven National Laboratory
- DOE Contract Number:
- AC02-76CH00016
- OSTI ID:
- 279998
- 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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