Abstract
We report on measurements and a detailed analysis of the reversible magnetization of superconducting ${\text{NbSe}}_{2}$ single crystals. By comparing the experimental data with Ginzburg Landau theory we show that superconductivity in ${\text{NbSe}}_{2}$ cannot be explained by an anisotropic single-band but by a multiband scenario. Applying a simple two-band model reveals the basic mixed-state parameters, which are quite different in the two bands. We identify a strongly anisotropic band that determines the properties at high magnetic fields and a second almost isotropic band that dominates at low fields. Our method is well suited for distinguishing anisotropic single-band from multiband superconductivity in various materials.
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