Numerical Renormalization Group Study of Kondo Effect in Unconventional Superconductors

Abstract

Orbital degrees of freedom of a Cooper pair play an important role in the unconventional superconductivity. To elucidate the orbital effect in the Kondo problem, we investigated a single magnetic impurity coupled to Cooper pairs with a $p_x+i{p}_y$ ($d_{x^2-y^2}+i{d}_{xy}$) symmetry using the numerical renormalization group method. It is found that the ground state is always a spin doublet. The analytical solution for the strong coupling limit explicitly shows that the orbital dynamics of the Cooper pair generates the spin 1/2 of the ground state.

4 pages, 2 figures, JPSJ.sty, to be published in J. Phys. Soc. Jpn. 70 (2001) No. 10

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Cited by in corpus (13)

• The numerical renormalization group method for quantum impurity systems
• Quantum phase transition in a minimal model for the Kondo effect in a Josephson junction
• Kondo effect in asymmetric Josephson couplings through a quantum dot
• Kondo Signatures of a Quantum Magnetic Impurity in Topological Superconductors
• Single Impurity Effects in Multiband Superconductors with Different Sign Order Parameters
• Anomaly in the heat capacity of Kondo superconductors
• Kondo screening in unconventional superconductors: The role of anomalous propagators
• Quantum impurities in channel mixing baths
• Magnetic-impurity resonance states for different pairing symmetries in twisted bilayer graphene
• Temperature-dependent spectral function of a Kondo impurity in an $s$-wave superconductor
• Spin and orbital effects of Cooper pairs coupled to a single magnetic impurity
• Nonvanishing Local Moment in Triplet Superconductors
• Kondo Compensation in a Pseudogap Phase: a Renormalization Group Study