Physics – Condensed Matter – Strongly Correlated Electrons
Scientific paper
1999-05-12
Phys. Rev. B 61, 1211 (2000)
Physics
Condensed Matter
Strongly Correlated Electrons
7 pages including 3 figures
Scientific paper
10.1103/PhysRevB.61.1211
We investigate the phase diagram of an extended Kondo lattice model for doped manganese oxides in the presence of strong but finite Hund's coupling and on-site Coulomb interaction. By means of the Schwinger-boson mean-field approach, it is found that, besides magnetic ordering, there will be non-uniform charge distributions, such as charge ordering and phase separation, if the interaction between electrons prevails over the hybridization. Which of the charge ordering and phase separation appears is determined by a competition between effective repulsive and attractive interactions due to virtual processes of electron hopping. Calculated results show that strong electron correlations caused by the on-site Coulomb interaction as well as the finite Hund's coupling play an important role in the magnetic ordering and charge distribution at low temperatures.
Gu R. Y.
Shen Shun-Qing
Wang Zheng-Dong
Xing Ding-Yu
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