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Effect of Spin Fluctuations on Phonon-Mediated Superconductivity in the Vicinity of a Quantum Critical Point | | Y. L. Loh
; P. B. Littlewood
; | | Date: |
28 Nov 2006 | | Subject: | Superconductivity; Strongly Correlated Electrons | | Abstract: | We consider an s-wave superconductor in the vicinity of a second-order ferromagnetic (FM) or spin-density-wave (SDW) quantum critical point (QCP), where the superconductivity and magnetism arise from separate mechanisms. The quantum critical spin fluctuations reduce the superconducting T_c. Near a FM QCP, we find that T_c falls to zero as 1/ ln kappa in 3D and as kappa in 2D, where kappa ~ J-J_c ^nu is the inverse correlation length of the spin fluctuations, and measures the distance J-J_c from the quantum critical point. SDW quantum critical fluctuations, on the other hand, suppress T_c to zero as sqrt(kappa) in 2D, and suppress T_c only to a finite value in 3D, producing a cusp of the form (const + J-J_c ^nu). | | Source: | arXiv, cond-mat/0611718 | | Services: | Forum | Review | PDF | Favorites | |
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