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Title: d-wave superconductivity from electron-phonon interactions
Authors: Hague, J.P.
Issue Date: 2006
Publisher: © American Physical Society
Citation: HAGUE, J.P., 2006. d-wave superconductivity from electron-phonon interactions. Physical Review B, 73(6), 060503
Abstract: I examine electron-phonon mediated superconductivity in the intermediate coupling and phonon frequency regime of the quasi-two-dimensional Holstein model. I use an extended Migdal-Eliashberg theory that includes vertex corrections and spatial fluctuations. I find a d-wave superconducting state that is unique close to half filling. The order parameter undergoes a transition to s-wave superconductivity on increasing filling. I explain how the inclusion of both vertex corrections and spatial fluctuations is essential for the prediction of a d-wave order parameter. I then discuss the effects of a large Coulomb pseudopotential on the superconductivity (such as is found in contemporary superconducting materials like the cuprates), which results in the destruction of the s-wave states, while leaving the d-wave states unmodified.
Description: This article has been published in the journal, Physical Review B [© American Physical Society]. It is also available at: http://link.aps.org/abstract/PRB/v73/e060503.
URI: https://dspace.lboro.ac.uk/2134/1352
ISSN: 1098-0121
Appears in Collections:Published Articles (Physics)

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