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Zusammenfassung:
The symmetry of superconductivity in borocarbides LuNi2B2C and YNi2B2C is an outstanding issue. Here an anisotropic s-wave order parameter (or s+g model) is proposed for LuNi2B2C and YNi2B2C. In spite of a substantial s-wave component, the present superconducting order parameter Delta(k) has nodes and gives rise to the rootH dependent specific heat in the vortex state (the Volovik effect). This model predicts the fourfold symmetry both in the angular dependent thermal conductivity and in the excess Dingle temperature in the vortex state, which should be readily accessible experimentally.
