A microspectroscopic study of the electronic homogeneity of ordered and disordered Sr2FeMoO6

Topwal, D and Manjunath, UH and Ray, Samriddhi Sankar and Raj, S and Sarma, DD and Krishnakumar, SR and Bertolo, M and La Rosa, S and Cautero, G (2006) A microspectroscopic study of the electronic homogeneity of ordered and disordered Sr2FeMoO6. In: International Conference on Recent Developments in Metal Oxides and Related Materials,, Jan 09-11, 2006, Bangalore, India, pp. 87-92.

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Abstract

Disordered Sr2FeMoO6 shows a drastic reduction in saturation magnetization compared to highly ordered samples, moreover magnetization as a function of the temperature for different disordered samples shows qualitatively different behaviours. We investigate the origin of such diversity by performing spatially resolved photoemission spectroscopy on various disordered samples. Our results establish that extensive electronic inhomogeneity, arising most probably from an underlying chemical inhomogeneity in disordered samples, is responsible for the observed magnetic inhomogeneity. It is further pointed out that these inhomogeneities are connected with composition fluctuations of the type Sr2Fe1+xMo1-xO6 with Fe-rich (x > 0) and Mo-rich (x < 0) regions.

Item Type:	Conference Paper
Publication:	JOURNAL OF CHEMICAL SCIENCES
Publisher:	Indian Academy of Sciences
Additional Information:	Copyright of this article belongs to Indian Academy of Sciences.
Keywords:	Double-perovskite structure; disordered Sr2FeMoO6; chemical/electronic inhomogeneity; phase separation; spectromicroscopy; spatially resolved photoemission spectroscopy.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	09 Sep 2010 04:50
Last Modified:	19 Sep 2010 06:15
URI:	http://eprints.iisc.ac.in/id/eprint/31841

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