Mishra, SK and Pandit, Rahul and Satpathy, Shashi (1997) Charge ordering via electron-electron interactions in the colossal-magnetoresistive manganites. In: Physical Review B, 56 (5). pp. 2316-2319.
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Abstract
The coupled magnetic and charge-order transition observed in the manganites of the type R1-xMxMnO3 near half filling (x similar or equal to 1/2) is shown to be the result of the interplay between the double-exchange, superexchange, and the Coulomb interaction terms in an electronic Hamiltonian. At half tilling and temperature T=0 we find, as we increase the strength of the extended-Hubbard repulsion, a first-order transition from a charge-nonordered ferromagnetic metal (FN) to a charge-ordered antiferromagnetic and insulating (AFO) ground state. The AFO-FN transition is also obtained by increasing T: however, a small degree of charge order remains ill the ferromagnetic phase. The charge-ordered state also ''melts,'' as observed, on the application of a magnetic field, which causes a rapid drop in the transition temperature. Qualitative differences ill behavior between members of the manganite series can be understood in terms of small variations in the interaction parameters.
Item Type: | Journal Article |
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Publication: | Physical Review B |
Publisher: | The American Physical Society |
Additional Information: | Copyright of this article belongs to The American Physical Society. |
Department/Centre: | Division of Physical & Mathematical Sciences > Physics |
Date Deposited: | 13 Mar 2009 08:28 |
Last Modified: | 19 Sep 2010 05:24 |
URI: | http://eprints.iisc.ac.in/id/eprint/18685 |
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