Density of States and NMR Relaxation Rate in Anisotropic Superconductivity with Intersecting Line Nodes

Details Density of States and NMR Relaxation Rate in Anisotropic Superconductivity with Intersecting Line Nodes Density of States and NMR Relaxation Rate in Anisotropic Superconductivity with Intersecting Line Nodes

1996-09-18

arxiv.org/abs/supr-con/9609003v1

Physics

Condensed Matter

Superconductivity

7 pages, 4 PostScript Figures, LaTeX, to appear in J. Phys. Soc. Jpn

Scientific paper

10.1143/JPSJ.65.3131

We show that the density of states in an anisotropic superconductor with intersecting line nodes in the gap function is proportional to $E log (\alpha \Delta_0 /E)$ for $|E| << \Delta_0$, where $\Delta_0$ is the maximum value of the gap function and $\alpha$ is constant, while it is proportional to $E$ if the line nodes do not intersect. As a result, a logarithmic correction appears in the temperature dependence of the NMR relaxation rate and the specific heat, which can be observed experimentally. By comparing with those for the heavy fermion superconductors, we can obtain information about the symmetry of the gap function.

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