Physics – Condensed Matter – Superconductivity
Scientific paper
2007-02-06
Solid State Communication, vol. 148. page 582 (2008)
Physics
Condensed Matter
Superconductivity
9 pages, 14 figures
Scientific paper
10.1016/j.ssc.2008.09.037
Inhomogeneity is introduced through random local interactions (Ui) in an attractive Hubbard model on a square lattice and studied using mean-field Bogoliubov-de Gennes formalism. Superconductivity is found to get suppressed by the random Ui contrary to the results of a bimodal distribution of Ui. The proximity effect of superconductivity is found to be strong, all sites develop non-zero pairing amplitude. The gap in the density of states is always non-zero and does not vanish even for strong disorder. When two such superconductors are coupled via a channel, the effect of one on the other is negligible. The length and width of the connector, do not seem to have any noticeable effect on the superconductivity in either systems. The superconducting blocks behave as independent entity and the introduction of the channel have no effect on them.
Chatterjee Budhaditya
Taraphder A.
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