Local Density of States near the Surface of a d+s-Wave Superconductor in the Two-Dimensional t-J Model : Condensed Matter: Electronic Properties, etc.

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Recent calculation found a new type of pairing states, i.e., a spatially oscillating d + s-wave symmetry, in the two-dimensional t-J model [M. Ogata: J. Phys. Soc. Jpn. 66 (1997) 3375.] The d + s-wave state is a possible candidate for electron-doped cuprates because the quasiparticle states in the bulk are fully-gapped reflecting the lack of nodes in k space. We calculate the local density of states near the surface for the case of d + s-wave symmetry. It is shown that a zero-energy peak shows up in the local density of states near a (110) surface, even though there is no nodes in the d + s-wave state. However, due to the absence of the nodes, we find that the zero-energy peak splits. This means that the d + s-wave state has a very unique character. The present result is compared with experimental data on Nd_<1.85>Ce_<0.15>CuO_4.
社団法人日本物理学会の論文
2000-05-15