Prefer a chat interface with context about you and your work?
Anomalous impurity effect in the heavy-fermion superconductor <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:msub><mml:mi>CeCu</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:msub><mml:mi>Si</mml:mi><mml:mn>2</mml:mn></mml:msub></mml:mrow></mml:math>
Recent observations of a contradictory impurity effect in the heavy-fermion superconductor ${\mathrm{CeCu}}_{2}{\mathrm{Si}}_{2}$ 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 ${s}^{\ifmmode\pm\else\textpm\fi{}}$-wave pairing, and report an anomalous nonmonotonic variation of its ${T}_{c}$ suppression …