Charge ordering via electron-electron interactions in the colossal-magnetoresistive manganites

Mishra, S. K. ; Pandit, Rahul ; Satpathy, Sashi (1997) Charge ordering via electron-electron interactions in the colossal-magnetoresistive manganites Physical Review B: Condensed Matter and Materials Physics, 56 (5). pp. 2316-2319. ISSN 1098-0121

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Official URL: http://prb.aps.org/abstract/PRB/v56/i5/p2316_1

Related URL: http://dx.doi.org/10.1103/PhysRevB.56.2316

Abstract

The coupled magnetic and charge-order transition observed in the manganites of the type R1-xMxMnO3 near half filling (x⋍½) 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 filling 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 in 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 in behavior between members of the manganite series can be understood in terms of small variations in the interaction parameters.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:33602
Deposited On:30 Mar 2011 12:34
Last Modified:17 May 2016 16:28

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