Effective Hamiltonian of oxide superconductors and a narrow band near the Fermi level
S. Ishihara, H. Matsumoto, M. Tachiki
DOI 10.1103/PhysRevB.42.10041 · Physical Review B
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Abstract
The change of an electronic state near the insulator-metal transition is studied by an effective Hamiltonian obtained from the highly correlated p-d mixing model. The d-electron freedom is reduced to only its spin freedom. The model becomes a modified Kondo model in the sense that the spin interaction between the p and d electrons is momentum dependent, and its strength and dependence on momentum are correlated with the kinetic term of the p electron. The results show that a tail structure at the top of the occupied p band is induced and a new narrow band develops at the Fermi level, which is split from the main p band. The effects of a nonbonding band are also discussed.
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