Schrieffer-Wolff transformation for the Anderson Hamiltonian in a superconductor

M. M. Salomaa

doi:10.1103/PhysRevB.37.9312

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Schrieffer-Wolff transformation for the Anderson Hamiltonian in a superconductor

M. M. Salomaa

DOI 10.1103/PhysRevB.37.9312 · Physical Review B

T1

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Abstract

A generalized Schrieffer-Wolff transformation is introduced to relate the Anderson impurity model in a superconductor to a Kondo-like Hamiltonian. The effective exchange interactions coupling a magnetic impurity to a Bardeen-Cooper-Schrieffer (BCS) spectrum of electronic excitations are expressed in terms of the superconducting coherence factors. New exchange mechanisms originate from the particle-hole coherence unique to superconductors. These interactions are relevant for large asymmetry in the magnetic limit; they vanish for nonmagnetic impurities and in the symmetric Anderson model, for which the ‘‘normal’’ Schrieffer-Wolff coupling constant is recovered. The magnetically induced equal-spin Cooper-pairing correlations are suggested to be relevant for superconducting valence fluctuators and within heavy-fermion superconductivity.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
UBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
U1-xThxBe13 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown