The upward curvature of Hc2(T) in CsV3Sb5 is attributed to Fermi velocity anisotropy from van Hove singularities, not to multiple superconducting gaps.
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Origin of the Unusual Temperature Dependence of the Upper Critical Field of Kagome Superconductor CsV3Sb5: Multiple Bands or van Hove Singularities?
The upward curvature of Hc2(T) in CsV3Sb5 is attributed to Fermi velocity anisotropy from van Hove singularities, not to multiple superconducting gaps.