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Magnetism, charge ordering, and metal-insulator transition in the lanthanum manganites

Mishra, SK and Pandit, R and Satpathy, S (1997) Magnetism, charge ordering, and metal-insulator transition in the lanthanum manganites. In: Journal of Applied Physics, 81 (8). p. 4977.

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Abstract

We examine the magnetic and structural properties of the lanthanum manganite-based double-exchange magnets exhibiting colossal magnetoresistance. A model Hamiltonian containing the double-exchange, superexchange, and the Hubbard terms, with parameters obtained from density–functional calculations (Ref. 1), is studied within a mean-field approximation both at temperature T=0 and T>0 and with the effects of the magnetic field included. The phase diagrams we obtain with magnetic and charge-ordered phases enable us to examine the competition between the double- and superexchange terms as functions of doping and temperature. Our theoretical study provides a qualitative understanding of the phase diagram observed in the experiments. © 1997 American Institute of Physics.

Item Type: Editorials/Short Communications
Additional Information: Copyright of this article belongs to American Institute of Physic.
Department/Centre: Division of Physical & Mathematical Sciences > Physics
Date Deposited: 30 Jun 2011 14:43
Last Modified: 30 Jun 2011 14:43
URI: http://eprints.iisc.ernet.in/id/eprint/38292

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