期刊
PHYSICAL REVIEW B
卷 79, 期 22, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.79.224508
关键词
bound states; electronic density of states; iron compounds; lanthanum compounds; superconducting materials; superconductive tunnelling; surface states; tunnelling spectra
We discuss the tunneling spectroscopy at a surface in multiband systems such as Fe-based superconductors with the use of the quasiclassical approach. We extend the single-band method by M. Matsumoto and H. Shiba [J. Phys. Soc. Jpn. 64, 1703 (1995)] into n-band systems (n >= 2). We show that the appearance condition of the zero-bias conductance peak does not depend on details of the pair-potential anisotropy, but it depends on details of the normal-state properties in the case of fully gapped superconductors. The surface density of states in a two-band superconductor is presented as a simplest application. The quasiclassical approach enables us to calculate readily the surface-angular dependence of the tunneling spectroscopy.
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