Theory for tunneling spectroscopy of anisotropic superconductors

Journal Article · Thu Feb 01 04:00:00 EST 1996 · Physical Review, B: Condensed Matter

DOI:https://doi.org/10.1103/PhysRevB.53.2667· OSTI ID:279469

Kashiwaya, S ^[1]; Tanaka, Y ^[2]; Koyanagi, M; Kajimura, K ^[1]

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1. Electrotechnical Laboratory, Umezono, Tsukuba, Ibaraki 305 (Japan)
2. Niigata University, Igarashi, Niigata 950-21 (Japan)

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.}

• OSTI ID: 279469
• Journal Information: Physical Review, B: Condensed Matter, Journal Name: Physical Review, B: Condensed Matter Journal Issue: 5 Vol. 53; ISSN 0163-1829; ISSN PRBMDO
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
ANISOTROPY
D WAVES
ENERGY-LEVEL DENSITY
METALS
MIS JUNCTIONS
S WAVES
SUPERCONDUCTORS
TUNNEL EFFECT