Actions for Highly anisotropic but nodeless gap from a valence-fluctuation pairing mechanism [electronic resource].
Highly anisotropic but nodeless gap from a valence-fluctuation pairing mechanism [electronic resource].
- Published
- Washington, D.C. : United States. Dept. of Energy, 1993.
Oak Ridge, Tenn. : Distributed by the Office of Scientific and Technical Information, U.S. Dept. of Energy. - Physical Description
- Pages: (5 pages) : digital, PDF file
- Additional Creators
- Los Alamos National Laboratory, United States. Department of Energy, and United States. Department of Energy. Office of Scientific and Technical Information
Access Online
- Restrictions on Access
- Free-to-read Unrestricted online access
- Summary
- We have refined and quantitatively explored a valence-fluctuation pairing mechanism, the finite-U mechanism introduced by Newns. This can provide an s-like (nodeless) gap. We use an Anderson-lattice Hamiltonian, with realistic parameter values derived from photoemission and BIS data. The Landau-Luttinger quasiparticle spectrum and the pairing interaction are obtained from a many-body variational formalism. Adequate pairing attraction is obtained, together with band narrowing (mass enhancement) and an extremely short coherence length, in reasonable agreement with experiment. These fully self-consistent results were obtained with an isotropic approximation to the band structure of a single CuO[sub 2] plane. Now, using a simplified treatment for a more realistic band structure, we find that the gap has strong in-plane anisotropy, although it should probably still remain nodeless. This conclusion is consistent with a variety of data.
- Report Numbers
- E 1.99:la-ur-93-1088
E 1.99: conf-930367--1
conf-930367--1
la-ur-93-1088 - Subject(s)
- Other Subject(s)
- Copper Oxides
- Band Theory
- Analytical Solution
- Anisotropy
- Energy Gap
- High-Tc Superconductors
- Pairing Interactions
- Photoemission
- Superconductivity
- Chalcogenides
- Copper Compounds
- Electric Conductivity
- Electrical Properties
- Emission
- Interactions
- Oxides
- Oxygen Compounds
- Physical Properties
- Secondary Emission
- Superconductors
- Transition Element Compounds
- Note
- Published through SciTech Connect.
01/01/1993.
"la-ur-93-1088"
" conf-930367--1"
"DE93010738"
Conference on spectroscopies in novel superconductors, Santa Fe, NM (United States), 17-19 Mar 1993.
Brandow, B.H. - Funding Information
- W-7405-ENG-36
View MARC record | catkey: 14063796