Abstract
We have performed electrical resistivity measurements at different pressures on two kinds of samples (low-Tc and high-Tc), which differ in physical properties of the heavy-fermion superconductor CeCu2Si2. It was found that one with lower Tc shows ∂Tc/∂P of negative and the other with higher Tc shows ∂Tc/∂P of positive. Therefore, the superconductivity for these two samples may have different origins.
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