Abstract
It is demonstrated that the slope of the upper critical field | dH c2 / dT| T c in superconductors with d-wave pairing drops rather fast with concentration of normal impurities, while in superconductors with anisotropic s-wave pairing | dH c2 / dT| T c grows, and in the limit of strong disorder is described by the known dependences of the theory of “dirty” superconductors. This allows to use the measurements of H c2 in disordered superconductors to discriminate between these different types of pairing in high-temperature supercondcutors.
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