Investigation of the local Fe magnetic moments at the grain boundaries of the Ca2FeReO6 double perovskite

Azimonte, C and Granado, E and Cezar, JC and Gopalakrishnan, J and Ramesha, K (2007) Investigation of the local Fe magnetic moments at the grain boundaries of the Ca2FeReO6 double perovskite. In: 10th Joint Magnetism and Magnetic Materials Conference/International Magnetics Conference, JAN 07-11, 2007, Baltimore.

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Abstract

The local Fe ferromagnetic (FM) moment at the grain boundaries of a ceramic sample of Ca2FeReO6 double perovskite was investigated by means of x-ray magnetic circular dichroism spectroscopy at the Fe L-2,L-3 edges and compared to the overall bulk magnetization. We found that, at the grain boundaries, the Fe FM moments at H=5 T are much smaller than expected and that the MxH curve is harder than in the bulk magnetization. These results suggest a larger degree of Fe/Re antisite disorder at the grain boundaries of this sample, shedding light into the intriguing nonmetallic resistivity behavior despite the reported presence of free carriers. (c) 2007 American Institute of Physics.

Item Type:	Conference Paper
Publisher:	American Institute of Physics
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:	30 Mar 2010 12:08
Last Modified:	19 Sep 2010 05:57
URI:	http://eprints.iisc.ac.in/id/eprint/26282

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