Abstract

To clarify the superconducting property of the nickel borocarbides RNi 2 B 2 C, FLAPW bandstructure calculations have been performed for YNi 2 B 2 C and LuNi 2 B 2 C. In both cases, the Fermi surface has the strong saddle point which is related to an anisotropic gap behavior in YNi 2 B 2 C and partial nesting property in LuNi 2 B 2 C, which also explains the SDW ordering in ErNi 2 B 2 C.

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