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標題: Electron spin resonance study of colossal magnetoresistive materials La0.7Ba0.3Mn1-xFexO3 (x=0.08-0.2)
作者: Lu, T.P.
Wu, C.C.
Lan, M.D.
關鍵字: Colossal magnetoresistance;Phase separation;double-exchange;Electron;spin resonance;magnetic-properties;la0.7ca0.3mno3;fe;la2/3ca1/3mno3;temperature;transition;esr
Project: Physica B-Condensed Matter
期刊/報告no:: Physica B-Condensed Matter, Volume 405, Issue 13, Page(s) 2891-2895.
Electron spin resonance (ESR) was carried out on the La0.7Ba0.3Mn1-xFexO3 (x=0.08-0.2) compounds over the temperature range of 100-300 K. We observed that the temperature dependence of the EPR spectra has a phase separation phenomenon below T-C for x=0.08-0.15 samples. Phase transition and temperature dependence of ESR, g(eff) value, linewidth, and intensity were determined. The g-value increases gradually with decrease in temperature in the paramagnetic state. The activation energies obtained from the temperature dependence of resonance intensity and linewidth are smaller in the Fe-doped sample. The ferromagnetic spin correlations would be significantly weakened by partially substituting the Mn with Fe. (C) 2010 Elsevier B.V. All rights reserved.
ISSN: 0921-4526
DOI: 10.1016/j.physb.2010.04.017
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