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Magnetic phases of electron-doped manganites

Pai, Venkateswara G (2001) Magnetic phases of electron-doped manganites. In: Physical Review B, 6417 (17). 064431-1.

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We study the anisotropic magnetic structures exhibited by electron-doped manganites using a model which incorporates the double exchange between orbitally degenerate eg electrons and the superexchange between t2g electrons with realistic values of the Hund’s coupling (JH), the superexchange coupling (JAF), and the bandwidth (W). We look at the relative stabilities of the G-, C-, and A-type antiferromagnetic phases. In particular we find that the G phase is stable for low electron doping as seen in experiments. We find good agreement with the experimentally observed magnetic phase diagrams of electron-doped manganites (x.0.5) such as Nd12xSrxMnO3, Pr1 2xSrxMnO3, and Sm12xCaxMnO3. We can also explain the experimentally observed orbital structures of the C and A phases. We also extend our calculation for electron-doped bilayer manganites of the form R222xA112xMn2O7 and predict that the C phase will be absent in these systems due to their reduced dimensionality.

Item Type: Journal Article
Publication: Physical Review B
Publisher: American Physical Society
Additional Information: Copyright of this article belongs to American Physical Society.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 29 Oct 2009 09:04
Last Modified: 19 Sep 2010 04:55
URI: http://eprints.iisc.ac.in/id/eprint/17132

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