Origin of ferromagnetism and its pressure and doping dependence in Tl2Mn2O7

Saha-Dasgupta, T. ; De Raychaudhury, Molly ; Sarma, D. D. (2006) Origin of ferromagnetism and its pressure and doping dependence in Tl2Mn2O7 Physical Review Letters, 96 (8). 087205 _1-087205 _4. ISSN 0031-9007

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Official URL: http://prl.aps.org/abstract/PRL/v96/i8/e087205

Related URL: http://dx.doi.org/10.1103/PhysRevLett.96.087205

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 Tc estimated using computed exchange integrals are found to be in good agreement with measurements. We find an enhancement of Tc for moderate doping with nonmagnetic Sb and a suppression of Tc upon application of pressure, both in agreement with experimental findings.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:46370
Deposited On:04 Jul 2011 12:07
Last Modified:18 May 2016 02:16

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