Tuesday, August 6, 2013

1308.0839 (J. H. Pixley et al.)

Pairing Correlations Near a Kondo-Destruction Quantum Critical Point    [PDF]

J. H. Pixley, Lili Deng, Kevin Ingersent, Qimiao Si
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.
View original: http://arxiv.org/abs/1308.0839

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