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Insulator-metal transition and magnetoresistance of La0.5Ca0.5MnOy induced by tuning the oxygen content

Zhao, YG and Cai, W and Zhao, J and Zhang, XP and Fan, R and Cao, BS and Zhu, MH and Wu, Tom and Ogale, SB and Shinde, SR and Venkatesan, T and Tu, QY and Mandal, TK and Gopalakrishnan, J (2002) Insulator-metal transition and magnetoresistance of La0.5Ca0.5MnOy induced by tuning the oxygen content. In: Journal of Applied Physics, 92 (9). pp. 5391-5394.

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Abstract

The oxygen content of La0.5Ca0.5MnOy 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 La0.5Ca0.5MnOy. (C) 2002 American Institute of Physics.

Item Type: Journal Article
Additional Information: Copyright of this article belongs to American Institute of Physics.
Department/Centre: Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited: 19 Jul 2011 07:27
Last Modified: 08 Jan 2013 05:02
URI: http://eprints.iisc.ernet.in/id/eprint/39248

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