Theory of Tunneling Spectroscopy of d-Wave Superconductors
Yukio Tanaka, Satoshi Kashiwaya
DOI 10.1103/PhysRevLett.74.3451 · Physical Review Letters
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Abstract
A tunneling theory for a normal metal–insulator– d-wave superconductor junction is presented. In contrast to the s-wave superconductor, the tunneling conductance spectra strongly depend on the tunneling direction relative to the crystalline axes, and do not always represent the bulk density of states. Zero-bias conductance peaks are expected in ab-plane tunneling. The present theory systematically explains various experimental results in the tunneling spectroscopy of high- Tc superconductors.
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