Please use this identifier to cite or link to this item: http://hdl.handle.net/11455/70955
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
期刊/報告no:: Physica B-Condensed Matter, Volume 405, Issue 13, Page(s) 2891-2895.
摘要: 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.
URI: http://hdl.handle.net/11455/70955
ISSN: 0921-4526
文章連結: http://dx.doi.org/10.1016/j.physb.2010.04.017
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