Electrical transport and magnetic properties of La0.5Ca0.5MnO3-y with varying oxygen content

Zhao, YG and Cai, W and Zhao, J and Zhang, XP and Cao, BS and Zhu, MH and Zhang, LW and Ogale, SB and Wu, T and Venkatesan, T and Lu, L and Mandal, TK and Gopalakrishnan, J (2002) Electrical transport and magnetic properties of La0.5Ca0.5MnO3-y with varying oxygen content. In: Physical Review B: Condensed Matter and Materials Physics, 65 (14). p. 144406.

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Abstract

We report the tuning of oxygen content of La0.5Ca0.5MnO3-y and its effect on electrical transport and magnetic properties. A small reduction of oxygen content leads to a decrease in sample resistivity, which is more dramatic at low temperatures. No significant change is seen to occur in the magnetic properties for this case. Further reduction in the oxygen content increases the resistivity remarkably, as compared to the as-prepared sample. The amplitude of the ferromagnetic (FM) transition at 225 K decreases, and the antiferromagnetic (AFM) transition at 130 K disappears. For samples with y=0.17, insulator-metal transition and paramagnetic-ferromagnetic transition occur around 167 K. The results are explained in terms of the effect of oxygen vacancies on the coexistence of the metallic FM phase and the insulating charge ordered AFM phase.

Item Type:	Journal Article
Publication:	Physical Review B: Condensed Matter and Materials Physics
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	20 Jul 2011 08:18
Last Modified:	08 Jan 2013 04:50
URI:	http://eprints.iisc.ac.in/id/eprint/39162

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