Abstract
Based on two-band Ginzburg-Landau theory, we study the temperature and angular dependences of the upper critical field for superconducting NbSe\(_2\) crystals. We introduce two variational parameters in our approach, and provide the explicit equations to determine the upper critical field in arbitrary direction. Our analyses strongly support previous scanning tunneling microscopy results and specific heat data, pointing to the existence of two energy gaps in this compound. Our results thus suggest that besides MgB\(_{2}\), NbSe\({_2}\) is another example of two-gap superconductors.
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This work was supported by the Fundamental Research Funds for the Central Universities (Grant Nos. 12ZP11, 13TD03, 2014MS60) and Beijing Higher Education Elite Young Teacher Project.
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Huang, H., Liu, P., Lv, PL. et al. Theoretical Study on the Upper Critical Field of a Layered Superconductor NbSe\(_2\) . J Low Temp Phys 177, 217–225 (2014). https://doi.org/10.1007/s10909-014-1208-3
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DOI: https://doi.org/10.1007/s10909-014-1208-3