Impurity-induced in-gap states in superconductors are tied to sign-changing order parameters, and the effect can be used to test pairing symmetry in La3Ni2O7.
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Probing Sign-Changing Order Parameters via Impurity States in unconventional superconductors: Implications for La$_3$Ni$_2$O$_7$ Superconductors with interlayer pairing
Impurity-induced in-gap states in superconductors are tied to sign-changing order parameters, and the effect can be used to test pairing symmetry in La3Ni2O7.