Abstract
Abstract Magnetic field H dependence of the electronic specific heat coefficient γ was measured in various NbSe 2 crystals in the vortex states. With increasing residual resistivity ratio, γ ( H ) changed from conventional γ ∝ H behavior to the strongly sublinear function of H . The sublinear H dependence of γ is similar to that of nodal superconductors, while NbSe 2 is a nodeless superconductor. From measurements on the sample containing columnar defects, we found that the γ anomaly is brought by quasi-particle states outside of the vortex cores. This result suggests that excess quasi-particle states are generated by Doppler energy shift caused by supercurrent around vortices.
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