Effect of pressure on the electrical resistivity of CeCu2Si2

Abstract We have performed electrical resistivity measurements at different pressures on two kinds of samples (low- T c and high- T c ), which differ in physical properties of the heavy-fermion superconductor CeCu 2 Si 2 . It was found that one with lower T c shows ∂ T c /∂ P of negative and the other with higher T c shows ∂ T c /∂ P of positive. Therefore, the superconductivity for these two samples may have different origins.