Underscreened Kondo Compensation in a Superconductor
Underscreened Kondo Compensation in a Superconductor
A magnetic impurity with a larger $S=1$ spin remains partially screened by the Kondo effect when embedded in a metal. However, when placed within an $s$-wave superconductor, the interplay between the superconducting energy gap $\Delta$ and the Kondo temperature $T_K$ induces a quantum phase transition from an underscreened doublet Kondo …