Nonlinear current-voltage characteristics of oxygen-deficient La 0.67Ca0.33MnO3-y films

S. J. Liu, J. Y. Juang, J. Y. Lin, K. H. Wu, T. M. Uen, Y. S. Gou

Research output: Contribution to journalArticle

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Abstract

Two different types of nonlinear current-voltage characteristics are observed in oxygen-deficient La0.67 Ca0.33 MnO3-y (LCMO) films at temperatures below the insulator-metal transition. The paraboliclike dynamic conductance G (V), defined as dI / dV, curves near the zero bias observed in highly oxygen-deficient LCMO films implies the contribution from the spin-dependent tunneling transport between ferromagnetic clusters, with magnetic-disordered regions serving as tunneling barriers. On the other hand, for the slightly oxygen-deficient LCMO films, dips around the zero bias were observed in nonlinear G (V) curves and have been attributed to spin-flip scattering, with oxygen vacancies serving as scattering centers.

Original languageEnglish
Article number023917
JournalJournal of Applied Physics
Volume103
Issue number2
DOIs
Publication statusPublished - 2008 Feb 7

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electric potential
oxygen
curves
scattering
transition metals
insulators
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Nonlinear current-voltage characteristics of oxygen-deficient La 0.67Ca0.33MnO3-y films. / Liu, S. J.; Juang, J. Y.; Lin, J. Y.; Wu, K. H.; Uen, T. M.; Gou, Y. S.

In: Journal of Applied Physics, Vol. 103, No. 2, 023917, 07.02.2008.

Research output: Contribution to journalArticle

Liu, S. J. ; Juang, J. Y. ; Lin, J. Y. ; Wu, K. H. ; Uen, T. M. ; Gou, Y. S. / Nonlinear current-voltage characteristics of oxygen-deficient La 0.67Ca0.33MnO3-y films. In: Journal of Applied Physics. 2008 ; Vol. 103, No. 2.
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