A dynamical cluster approximation study of <i>T</i><sub>c</sub> in a composite superconducting-metallic two-component model.
ORAL
Abstract
Can we realize enhanced Tc in a low superfluid density superconductor by coupling it to a metal? This idea, which was postulated in [1] and shown perturbatively in [2], suggests that coupling a layer with a large pairing scale Δ0 but small phase stiffness to a non-interacting metallic layer can raise Tc to its mean-field value TMF =Δ0/2. We studied this system nonperturbatively using the dynamical cluster approximation for a 2D attractive Hubbard model coupled to a noninteracting metallic layer via interlayer hopping. In contrast to prior work, our results for Tc appear only to decrease with increasing interlayer coupling.
[1] S. A. Kivelson, Physica B (Amsterdam) 11, 61 (2002)
[2] E. Berg et al., Phys. Rev. B 78, 0904509 (2008)
[1] S. A. Kivelson, Physica B (Amsterdam) 11, 61 (2002)
[2] E. Berg et al., Phys. Rev. B 78, 0904509 (2008)
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Presenters
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Philip Dee
Department of Physics and Astronomy, The University of Tennessee, Knoxville, University of Tennessee, Knoxville
Authors
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Philip Dee
Department of Physics and Astronomy, The University of Tennessee, Knoxville, University of Tennessee, Knoxville
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Thomas Maier
Computational Sciences and Engineering Division and Center for Nanophase Materials Sciences, Oak Ridge National Laboratory, Oak Ridge National Laboratory, Oak Ridge National Lab, Center for Nanophase Materials Sciences,Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831-6164, USA and Computational Sciences and Engineering Division, Oak Ridge Nat, Computational Sciences and Engineering Division, Oak Ridge National Laboratory