Pairing correlations near a Kondo-destruction quantum critical point
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Motivated by the unconventional superconductivity observed in heavy-fermion metals, we investigate pairing susceptibilities near a continuous quantum phase transition of the Kondo-destruction type. We solve two-impurity Bose-Fermi Anderson models with Ising and Heisenberg forms of the interimpurity exchange interaction using continuous-time quantum Monte Carlo and numerical renormalization-group methods. Each model exhibits a Kondo-destruction quantum critical point separating Kondo-screened and local-moment phases. For antiferromagnetic interimpurity exchange interactions, singlet pairing is found to be enhanced in the vicinity of the transition. Implications of this result for heavy-fermion superconductivity are discussed.
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Pixley, J.H., Deng, Lili, Ingersent, Kevin, et al.. "Pairing correlations near a Kondo-destruction quantum critical point." Physical Review B, 91, no. 20 (2015) American Physical Society: 201109(R). http://dx.doi.org/10.1103/PhysRevB.91.201109.