Suppression of charge order, disappearance of antiferromagnetism, and emergence of ferromagnetism in $Nd_{0.5}Ca_{0.5}MnO_3$ nanoparticles

Rao, SS and Tripathi, S and Pandey, D and Bhat, SV (2006) Suppression of charge order, disappearance of antiferromagnetism, and emergence of ferromagnetism in $Nd_{0.5}Ca_{0.5}MnO_3$ nanoparticles. In: Physical Review B: Condensed Matter and Material Physics, 74 . 144416:1-144416:5.

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Abstract

$Nd_{0.5}Ca_{0.5}MnO_3$ nanoparticles (average diameter ~20 and 40 nm) are synthesized by the polymeric precursor sol-gel method and characterized by various physico-chemical techniques. Quite strikingly, in the 20 nm particles, the charge-ordered (CO) and the antiferromagnetic phases observed in the bulk below 250 K and 160 K, respectively, are completely absent. Instead, a ferromagnetic (FM) transition is observed at 95 K followed by an insulator-to-metal transition at 75 K. The 40 nm particles show a residual CO phase but a transition to the FM state also occurs, at a slightly higher temperature of 110 K.

Item Type:	Journal Article
Publication:	Physical Review B: Condensed Matter and Material Physics
Publisher:	American Physical Society
Additional Information:	Copyright of this article belongs to American Physical Society.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	29 May 2008
Last Modified:	19 Sep 2010 04:45
URI:	http://eprints.iisc.ac.in/id/eprint/14090

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