Impurity effects on s+g-wave superconductivity in borocarbides Y(Lu)Ni_2B_2C

Details Impurity effects on s+g-wave superconductivity in borocarbides Y(Lu)Ni_2B_2C Impurity effects on s+g-wave superconductivity in borocarbides Y(Lu)Ni_2B_2C

2003-06-11

arxiv.org/abs/cond-mat/0306293v1

Physics

Condensed Matter

Superconductivity

6 pages, 6 eps figures

Scientific paper

10.1103/PhysRevB.68.174510

Recently a hybrid s+g-wave pairing is proposed to describe the experimental observation for a nodal structure of the superconducting gap in borocarbide YNi$_2$B$_2$C and possibly LuNi$_2$B$_2$C. In this paper the impurity effects on the s+g-wave superconductivity are studied in both Born and unitarity limit. The quasiparticle density of states and thermodynamics are calculated. It is found that the nodal excitations in the clean system are immediately prohibited by impurity scattering and a finite energy gap increases quickly with the impurity scattering rate. This leads to an activated behavior in the temperature dependence of the specific heat. Qualitative agreement with the experimental results is shown. Comparison with d-wave and some anisotropic s-wave studied previously is also made.

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