Insulator-metal transition and magnetoresistance of La 0.5 Ca 0.5 MnO y induced by tuning the oxygen content

Y. G. Zhao*, W. Cai, J. Zhao, X. P. Zhang, R. Fan, B. S. Cao, M. H. Zhu, Tao Wu, S. B. Ogale, S. R. Shinde, T. Venkatesan, Q. Y. Tu, T. K. Mandal, J. Gopalakrishnan

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

9 Scopus citations

Abstract

The oxygen content of La 0.5 Ca 0.5 MnO y was tuned by annealing the samples at high temperatures in flowing nitrogen with graphite powder nearby. The reduction of oxygen content has dramatic effect on the electrical transport and magnetic properties. The samples with y=2.983, 2.83, and 2.803 show an insulator-metal transition, and an unusual temperature and magnetic-field dependence of the magnetoresistance. The paramagnetic- ferromagnetic transition also shifts to lower temperatures and the antiferromagnetic transition at lower temperature is suppressed. The results are discussed in terms of the effect of oxygen vacancies on the various properties of La 0.5 Ca 0.5 MnO y .

Original languageEnglish (US)
Pages (from-to)5391-5394
Number of pages4
JournalJournal of Applied Physics
Volume92
Issue number9
DOIs
StatePublished - Nov 1 2002

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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