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Effect of spontaneous decay of superconductor quasiparticles in the tunneling density of states [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:
9 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
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Summary:
Superconductivity has been successfully described with either the Landau-Ginzburg theory of second order phase transitions or with strong-coupling versions of the original BCS theory for almost fifty years. Recent tunneling and photoemission data on the cuprate oxide superconductors may now provide evidence of corrections to the mean field approximation. It has been shown by Zasadzinski et al. that there is a dip at eV ≃ 3Δ₀ in the SIS tunneling conductance, which is the derivative of the current across a superconductor-insulator-superconductor junction with respect to the applied voltage, for a set of cuprate superconductors whose {Tc}`s range from 5.5K to 100K. Recently L. Coffey and I proposed an explanation of this feature in terms of the spontaneous decay of mean field quasiparticles. We showed that corrections to the mean field approximation for a superconductor lead to different frequency thresholds for spontaneous quasiparticle decay with different superconductor order parameter symmetries. These effects lead to features in the superconductor density of states and in the SIS tunneling conductance and provide experimental evidence of d-wave symmetry for the superconductor order parameter in the cuprates. I discuss model and also evidence of quasiparticle decay in ARPES data on Bi₂Sr₂CaCu₂O₈.
Report Numbers:
E 1.99:la-ur--93-1384
E 1.99: conf-930367--3
conf-930367--3
la-ur--93-1384
Subject(s):
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Note:
Published through SciTech Connect.
05/01/1993.
"la-ur--93-1384"
" conf-930367--3"
"DE93012681"
Conference on spectroscopies in novel superconductors,Santa Fe, NM (United States),17-19 Mar 1993.
Coffey, D.
Funding Information:
W-7405-ENG-36
View MARC record | catkey: 14063217