Abstract
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 .
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