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Author Kashiwaya, S. ♦ Tanaka, Y. ♦ Koyanagi, M. ♦ Kajimura, K.
Source United States Department of Energy Office of Scientific and Technical Information
Content type Text
Language English
Subject Keyword PHYSICS ♦ SUPERCONDUCTORS ♦ TUNNEL EFFECT ♦ METALS ♦ ANISOTROPY ♦ D WAVES ♦ ENERGY-LEVEL DENSITY ♦ S WAVES ♦ MIS JUNCTIONS
Abstract A theory for the tunneling spectroscopy of a normal-metal{endash}insulator{endash}anisotropic-superconductor (N-I-S) junction is presented. In anisotropic superconductors, the effective pair potential felt by the quasiparticles depends on their wave vectors in contrast to the case of isotropic {ital s}-wave superconductors. By introducing the effect into the Blonder-Tinkham-Klapwidjk formula, a conductance formula for N-I-S junctions is obtained. It is shown that the conductance spectra are a function not only of the amplitudes of pair potentials but also of their phases. Tunneling conductance spectra calculated for various symmetries strongly depend on the relation between the tunneling direction and crystalline axes. In some crystalline angle regions of {ital d}-wave superconductors, a zero-energy peak in the conductance spectra is calculated. This conductance peak reflects the existence of anomalous bound states around the insulator{endash}anisotropic-superconductor interface. The relation between the tunneling conductance spectra and the local density of states of superconductors is discussed. {copyright} {ital 1996 The American Physical Society.}
ISSN 01631829
Educational Use Research
Learning Resource Type Article
Publisher Date 1996-02-01
Publisher Place United States
Journal Physical Review, B: Condensed Matter
Volume Number 53
Issue Number 5


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