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Abstract:
Stimulated by the unusual phase diagram of the superconducting states in
U]_,.Th,.Bei3 which furnished a renewed debate about the nature of the heavy-fermion superconduct¬
ing order parameter (conventionally anisotropic vs. unconventional), we have initiated a study of the
effect of impurities on the superconducting state of CeCu2Si2. We conclude a 'diamagnetic'
pair-breaking effect by the non-magnetic impurities La and Y and an additional "paramagnetic" one
by Gd. Comparison with low-temperature resistivity results in the normal state leads to the
assumption that the Tc — depression for vanishing dopant concentration is determined by a highly
anisotropic scattering of the heavy quasiparticles off these impurities.
