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Towards weakening of the Coulomb blockade in artificially prepared clusters of superconducting grains
1. D. V. Averin and K. K. Likharev, in Mesoscopic Phenomena in Solids, edited by B. Altshuler, P. A. Lee and R. A. Webb (Elsevier, Amsterdam, 1991), p. 167.
6. J. Rosenblatt, in Percolation, Localization and Superconductivity, edited by A. M. Goldman and S. A. Wolf (Plenum Press, New York, 1984), p. 431.
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The relative role of dipole-dipole interactions between induced polarization moments in the total charge balance of a model system of two clusters (each cluster contains Nsuperconducting grains) is analyzed. It is found that, due to its orientational nature, the dipole energy between clusters may overcome the direct Coulomb coupling between grains (within a single cluster). To verify the model predictions experimentally, specially prepared clusters with markedly distinctive grain-grain (ε c ) and cluster-cluster (ε d ) dielectric properties are needed. More specifically, clusters of Al-based superconducting grains embedded into SrTiO 3dielectric matrix (with ε c ≃ 104) and separated by a dielectric layer of Al 2 O 3 (with ε d ≃ 10) would result in a noticeable decrease of the total charging energy of the system.
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