Effective Hamiltonian of oxide superconductors and a narrow band near the Fermi level

Journal Article · Sat Dec 01 04:00:00 EST 1990 · Physical Review, B: Condensed Matter; (USA)

DOI:https://doi.org/10.1103/PhysRevB.42.10041· OSTI ID:6040580

Ishihara, S; Matsumoto, H; Tachiki, M ^[1]

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1. Institute for Materials Research, Tohoku University, Sendai 980 (Japan)

The change of an electronic state near the insulator-metal transition is studied by an effective Hamiltonian obtained from the highly correlated {ital p}-{ital d} mixing model. The {ital 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 {ital p} and {ital d} electrons is momentum dependent, and its strength and dependence on momentum are correlated with the kinetic term of the {ital p} electron. The results show that a tail structure at the top of the occupied {ital p} band is induced and a new narrow band develops at the Fermi level, which is split from the main {ital p} band. The effects of a nonbonding band are also discussed.

• OSTI ID: 6040580
• Journal Information: Physical Review, B: Condensed Matter; (USA), Journal Name: Physical Review, B: Condensed Matter; (USA) Journal Issue: 16 Vol. 42:16; ISSN PRBMD; ISSN 0163-1829
• Country of Publication: United States
• Language: English

Related Subjects

656100* -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
ALKALINE EARTH METAL COMPOUNDS
BAND THEORY
CALCIUM COMPOUNDS
CALCIUM OXIDES
CHALCOGENIDES
ELECTRIC CONDUCTIVITY
ELECTRICAL PROPERTIES
ELECTRONIC STRUCTURE
ENERGY LEVELS
FERMI LEVEL
HAMILTONIANS
HIGH-TC SUPERCONDUCTORS
MATHEMATICAL OPERATORS
MINERALS
OXIDE MINERALS
OXIDES
OXYGEN COMPOUNDS
PEROVSKITE
PEROVSKITES
PHYSICAL PROPERTIES
QUANTUM OPERATORS
SUPERCONDUCTIVITY
SUPERCONDUCTORS
TITANIUM COMPOUNDS
TITANIUM OXIDES
TRANSITION ELEMENT COMPOUNDS