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Abstract:
In Ce1−xGdxCu2.2Si2 spin-glass ordering coexists superconductivity below the “critical” (Tc → 0) concentration xcr = 5.1 at%. For samples with slightly lower Gd content, a small volume fraction of ⋍ 10% remains superconducting presumably due to demagnetizing effects. Thus, the full Tc(x) dependence is accessible. It closely follows the AG-result and proves the existence of a “paramagnetic” pair-breaking mechanism.
