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It is shown theoretically that the Sommerfeld coefficient $\gamma(B)$ in themixed state contains useful information on the gap topology in asuperconductor. We accurately evaluate $\gamma(B)$ against magnetic induction$B$ by using microscopic quasi-classical theory. The linear portion in{$\gamma(\propto B)$} relative to $B_{\rm c2}$ and its slope in low fieldfaithfully corresponds to the gap anisotropy, so that we can distinguish thenodal gap and the anisotropic full gap, and estimate the magnitude of the gapanisotropy.Comment: 4 pages, 3 figures. Submitte

Field dependence of the zero-energy density of states around vortices in an anisotropic-gap superconductor