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Type: Artigo de periódico
Title: Role of orbital degeneracy in double-exchange systems
Author: Laad, MS
Craco, I
Muller-Hartmann, E
Abstract: We investigate the role of orbital degeneracy in the double-exchange model. In the J(H)--> infinity limit, an effective generalized 'Hubbard' model incorporating orbital pseudospin degrees of freedom is derived. The model possesses an exact solution in one and in infinite dimensions. In one-dimension, the metallic phase off 'half-filling' is a Luttinger liquid with pseudospin-charge separation. Using the d=infinity solution for our effective model, we show how many experimental observations for the well-doped (x similar or equal to0.3) three-dimensional manganites La1-xSrxMnO3 can be qualitatively explained by invoking the role of orbital degeneracy in the double exchange model.
Country: EUA
Editor: American Physical Soc
Citation: Physical Review B. American Physical Soc, v. 63, n. 21, 2001.
Rights: aberto
Identifier DOI: 10.1103/PhysRevB.63.214419
Date Issue: 2001
Appears in Collections:Unicamp - Artigos e Outros Documentos

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