Theoretical evidence and chemical origin of the magnetism-dependent electrostructural coupling in La2NiMnO6

Das, Hena and Waghmare, Umesh V and Saha-Dasgupta, T and Sarma, DD (2009) Theoretical evidence and chemical origin of the magnetism-dependent electrostructural coupling in La2NiMnO6. In: Physical Review B, 79 (14).

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Abstract

Using first-principles density-functional calculations, we determine and analyze the Born effective charges Z(*) that describe the coupling between electric field and atomic displacements for ferromagnetic double-perovskite compound, La2NiMnO6. We find that th Born effective charge matrix of Ni in La2NiMnO6, has an anomalously large antisymmetric component, whose magnitude reduces substantially upon change in the magnetic ordering between Ni and Mn, showing it to be a magnetism-dependent electrostructural coupling. We use a local picture of the electronic structure obtained with Wannier functions, along with its band-by-band decomposition to determine its electronic origin.

Item Type:	Journal Article
Publication:	Physical Review B
Publisher:	The American Physical Society
Additional Information:	Copyright of this article belongs to The American Physical Society.
Keywords:	density functional theory;ferromagnetic materials; lanthanum compounds;magnetic susceptibility; magnetoelectric effects;nickel compounds; tight-binding calculations
Department/Centre:	Division of Chemical Sciences > Solid State & Structural Chemistry Unit
Date Deposited:	03 Jan 2010 09:36
Last Modified:	19 Sep 2010 05:33
URI:	http://eprints.iisc.ac.in/id/eprint/20543

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