Tuning the ferromagnetic transition temperature in La0.5Sr0.5CoO3 thin films

Manna, Kaustuv and Samal, D and Elizabeth, Suja and Kumar, Anil PS (2013) Tuning the ferromagnetic transition temperature in La0.5Sr0.5CoO3 thin films. In: Journal of Applied Physics, 114 (8). 083904_1-083904_5.

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Abstract

Epitaxial La0.5Sr0.5CoO3 (LSCO) thin films are grown on LaAlO3 (100) and SrTiO3 (100) substrates by pulsed laser ablation. By tuning the growth parameters, we are able to enhance the ferromagnetic transition temperature (T-C) up to 262 K as evident from ac susceptibility, dc magnetization, and resistivity measurements. The magnitude of T-C is the same as that for the bulk stoichiometric LSCO illustrating the high quality of the grown films. Detailed structural analysis clearly reveals that the induced strain in the LSCO film has no role behind this enhancement; in fact, the determining factor is the oxygen stoichiometry. The films also exhibit ageing effect as the T-C decreases with time. This is considered in terms of gradual change in the oxygen stoichiometry through diffusion process as the time progresses. (C) 2013 AIP Publishing LLC.

Item Type:	Journal Article
Publication:	Journal of Applied Physics
Publisher:	American Institute of Physics
Additional Information:	Copyright of this article belongs to American Institute of Physics.
Department/Centre:	Division of Physical & Mathematical Sciences > Physics
Date Deposited:	08 Oct 2013 08:58
Last Modified:	08 Oct 2013 08:58
URI:	http://eprints.iisc.ac.in/id/eprint/47486

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