Abstract
The challenge of the present knowledge of the electronic structure and selected thermodynamic properties on the mechanism of superconductivity in rare-earth transition metal borocarbides (nitrides) is discussed with respect to somewhat unexpected similarities with as well as to clear differences from the cuprate superconductors. The effect of substitutional nonmagnetic and magnetic disorder in the rare-earth intermediate layer in between the transition metal boron networks as well as in the network itself upon various thermodynamic properties in the superconducting state of Y x R 1− x C(Ni 1− y Pt y B) 2 R= Lu or Tb is studied theoretically as well as experimentally. The suppression of the upper critical field and its positive curvature near T c can be used as highly sensitive measures of the degree of disorder.
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