Dynamic spin fluctuations and the bag mechanism of high-/ital T//sub /ital c// superconductivity
The spin-bag approach to the high-temperature superconductivity is presented in detail. The general argument that the local supression of the electronic pseudogap lead to an attractive interaction of the quasiparticles is substantiated by the detailed calculation of the pairing potential mediated by the collective modes of the spin-density-wave background. In particular, the spin-wave spectrum, the sublattice magnetization and the spectral distribution of the collective modes are studied within the random-phase approximation. In the low-doping limit, different shapes of the Fermi surface give rise to a superconducting gap which formally has /ital d/-wave or /ital p/-wavelike symmetry, however the gap has no nodes on the Fermi surface. Therefore, the superconducting properties of our model are analogous to those of a conventional /ital s/-wave (i.e., nodeless) BCS superconductor. We also discuss possible bag effects in the large-/ital U/ Hubbard model and in charge-density-wave systems. Finally, the relation of our work with other approaches and with experiment are discussed briefly.
- Research Organization:
- Institute for Theoretical Physics, University of California, Santa Barbara, California 93106(US)
- OSTI ID:
- 6035617
- Journal Information:
- Phys. Rev. B: Condens. Matter; (United States), Vol. 39:16
- Country of Publication:
- United States
- Language:
- English
Similar Records
Angle-Resolved Photoemission Spectroscopy on Electronic Structure and Electron-Phonon Coupling in Cuprate Superconductors
Theory of spin dynamics in high-{ital T}{sub {ital c}} copper oxide superconductors. Application to neutron scattering
Related Subjects
SUPERCONDUCTIVITY AND SUPERFLUIDITY
SUPERCONDUCTORS
SPIN
BCS THEORY
COLLECTIVE EXCITATIONS
COPPER OXIDES
ENERGY GAP
FERMI LEVEL
FLUCTUATIONS
PAIRING INTERACTIONS
PLASMA WAVES
RANDOM PHASE APPROXIMATION
TRANSITION TEMPERATURE
ANGULAR MOMENTUM
CHALCOGENIDES
COPPER COMPOUNDS
ENERGY LEVELS
ENERGY-LEVEL TRANSITIONS
EXCITATION
INTERACTIONS
OXIDES
OXYGEN COMPOUNDS
PARTICLE PROPERTIES
PHYSICAL PROPERTIES
THERMODYNAMIC PROPERTIES
TRANSITION ELEMENT COMPOUNDS
VARIATIONS
656100* - Condensed Matter Physics- Superconductivity