Collective excitations in the normal state of Cu-O--based superconductors

Journal Article · Thu Jun 01 04:00:00 EDT 1989 · Phys. Rev. B: Condens. Matter; (United States)

DOI:https://doi.org/10.1103/PhysRevB.39.12371· OSTI ID:5999145

Littlewood, P B; Varma, C M; Schmitt-Rink, S; Abrahams, E

Standard weak-coupling methods are used to calculate the excitation spectrum and the instabilities of the metallic phase of a three-band model for the copper-oxide superconductors with both intra- and intersite repulsion. Besides the magnetic excitations, a strong charge-transfer resonance of /ital A//sub 1/ital g// symmetry is predicted. For reasonable parameters, the metallic phase is found to be unstable to a charge-transfer instability at large deviations from half filling, and at small deviations to an antiferromagnet.

• Research Organization: ATandT Bell Laboratories, Murray Hill, New Jersey 07974(US); Serin Physics Laboratory, Rutgers University, Piscataway, New Jersey 08855
• OSTI ID: 5999145
• Journal Information: Phys. Rev. B: Condens. Matter; (United States), Journal Name: Phys. Rev. B: Condens. Matter; (United States) Vol. 39:16; ISSN PRBMD
• Country of Publication: United States
• Language: English

Related Subjects

36 MATERIALS SCIENCE
360204* -- Ceramics
Cermets
& Refractories-- Physical Properties
656100 -- Condensed Matter Physics-- Superconductivity
75 CONDENSED MATTER PHYSICS
SUPERCONDUCTIVITY AND SUPERFLUIDITY
CHALCOGENIDES
COLLECTIVE EXCITATIONS
COPPER COMPOUNDS
COPPER OXIDES
ENERGY-LEVEL TRANSITIONS
EXCITATION
HAMILTONIANS
INSTABILITY
MATHEMATICAL MODELS
MATHEMATICAL OPERATORS
NUCLEAR MODELS
OXIDES
OXYGEN COMPOUNDS
QUANTUM OPERATORS
SUPERCONDUCTORS
TRANSITION ELEMENT COMPOUNDS
WEAK-COUPLING MODEL