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To resolve the discrepancies of the superconducting order parameter inquasi-two-dimensional NbSe_2, comprehensive specific-heat measurements havebeen carried out. By analyzing both the zero-field and mixed-state data withmagnetic fields perpendicular to and parallel to the c axis of the crystal andusing the two-gap model, we conclude that (1) more than one energy scale of theorder parameter is required for superconducting NbSe_2 due to the thermodynamicconsistency; (2)delta_L=1.26 meV and delta_S=0.73 meV are obtained; (3)N_S(0)/N(0)=11%~20%; (4) The observation of the kink in gamma(H) curve suggeststhat the two-gap scenario is more favorable than the anisotropic s-wave modelto describe the gap structure of NbSe_2; and (5)delta_S is more isotropic andhas a three-dimensional-like feature and is located either on the Se or thebonding Nb Fermi sheets.

Experimental evidence for a two-gap structure of superconducting NbSe_2: a specific heat study in external magnetic fields