Insulator-metal transition and magnetoresistance of La 0.5Ca 0.5MnO 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; Tom Wu; S. B. Ogale; S. R. Shinde; T. Venkatesan; Q. Y. Tu; T. K. Mandal; J. Gopalakrishnan

doi:10.1063/1.1509108

Insulator-metal transition and magnetoresistance of La _0.5Ca _0.5MnO _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, Tom 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 journal › Article › peer-review

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Abstract

The oxygen content of La _0.5Ca _0.5MnO _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 _0.5Ca _0.5MnO _y.

Original language	English (US)
Pages (from-to)	5391-5394
Number of pages	4
Journal	Journal of Applied Physics
Volume	92
Issue number	9
DOIs	https://doi.org/10.1063/1.1509108
State	Published - Nov 1 2002
Externally published	Yes

ASJC Scopus subject areas

General Physics and Astronomy

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Zhao, Y. G., Cai, W., Zhao, J., Zhang, X. P., Fan, R., Cao, B. S., Zhu, M. H., Wu, T., Ogale, S. B., Shinde, S. R., Venkatesan, T., Tu, Q. Y., Mandal, T. K., & Gopalakrishnan, J. (2002). Insulator-metal transition and magnetoresistance of La _0.5Ca _0.5MnO _y induced by tuning the oxygen content. Journal of Applied Physics, 92(9), 5391-5394. https://doi.org/10.1063/1.1509108

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

abstract = "The oxygen content of La 0.5Ca 0.5MnO 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 0.5Ca 0.5MnO y.",

author = "Zhao, {Y. G.} and W. Cai and J. Zhao and Zhang, {X. P.} and R. Fan and Cao, {B. S.} and Zhu, {M. H.} and Tom Wu and Ogale, {S. B.} and Shinde, {S. R.} and T. Venkatesan and Tu, {Q. Y.} and Mandal, {T. K.} and J. Gopalakrishnan",

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doi = "10.1063/1.1509108",

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TY - JOUR

T1 - Insulator-metal transition and magnetoresistance of La 0.5Ca 0.5MnO y induced by tuning the oxygen content

AU - Zhao, Y. G.

AU - Cai, W.

AU - Zhao, J.

AU - Zhang, X. P.

AU - Fan, R.

AU - Cao, B. S.

AU - Zhu, M. H.

AU - Wu, Tom

AU - Ogale, S. B.

AU - Shinde, S. R.

AU - Venkatesan, T.

AU - Tu, Q. Y.

AU - Mandal, T. K.

AU - Gopalakrishnan, J.

PY - 2002/11/1

Y1 - 2002/11/1

N2 - The oxygen content of La 0.5Ca 0.5MnO 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 0.5Ca 0.5MnO y.

AB - The oxygen content of La 0.5Ca 0.5MnO 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 0.5Ca 0.5MnO y.

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U2 - 10.1063/1.1509108

DO - 10.1063/1.1509108

M3 - Article

AN - SCOPUS:18744409874

SN - 0021-8979

VL - 92

SP - 5391

EP - 5394

JO - Journal of Applied Physics

JF - Journal of Applied Physics

IS - 9

ER -

Insulator-metal transition and magnetoresistance of La _0.5Ca _0.5MnO _y induced by tuning the oxygen content

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