Anomalous impurity effect in the heavy-fermion superconductor CeCu2Si2
Anomalous impurity effect in the heavy-fermion superconductor CeCu2Si2
Recent observations of contradictory impurity effect in the heavy-fermion superconductor CeCu2Si2 at ambient pressure have hindered the identification of its pairing symmetry. Here we perform theoretical analyses with both intraband and interband impurity scatterings for the nodeless $s^\pm$-wave pairing, and report an anomalous nonmonotonic variation of its $T_c$ suppression with …