Origin of Ferromagnetism and its Pressure and Doping Dependence in Tl2Mn2O7

Saha-Dasgupta, T and De Raychaudhury, Molly and Sarma, DD (2006) Origin of Ferromagnetism and its Pressure and Doping Dependence in Tl2Mn2O7. In: Physical Review Letters, 96 (8). 087205 -1.

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Abstract

Using the Nth order muffin-tin obital downfolding technique, we investigate the origin of ferromagnetism in pyrochlore Tl2Mn2O7. It is found to be driven by a hybridization induced spin polarization of delocalized charge carriers derived from Tl-s and O-p states. The mean-field estimate of the ferromagnetic transition temperature T-c estimated using computed exchange integrals are found to be in good agreement with measurements. We find an enhancement of T-c for moderate doping with nonmagnetic Sb and a suppression of T-c upon application of pressure, both in agreement with experimental findings.

Item Type:	Journal Article
Publication:	Physical Review Letters
Publisher:	American Physical Society
Additional Information:	Copyright of this article4 belongs to American Physical Society.
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	06 Apr 2009 05:32
Last Modified:	19 Sep 2010 04:58
URI:	http://eprints.iisc.ac.in/id/eprint/17747

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