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Recently a hybrid s+g-wave pairing is proposed to describe the experimentalobservation for a nodal structure of the superconducting gap in borocarbideYNi$_2$B$_2$C and possibly LuNi$_2$B$_2$C. In this paper the impurity effectson the s+g-wave superconductivity are studied in both Born and unitarity limit.The quasiparticle density of states and thermodynamics are calculated. It isfound that the nodal excitations in the clean system are immediately prohibitedby impurity scattering and a finite energy gap increases quickly with theimpurity scattering rate. This leads to an activated behavior in thetemperature dependence of the specific heat. Qualitative agreement with theexperimental results is shown. Comparison with d-wave and some anisotropics-wave studied previously is also made.Comment: 6 pages, 6 eps figure

physical review. b, condensed matter

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Impurity effects ons+g-wave superconductivity in borocarbidesY(Lu)Ni2