| Full text | |
| Author(s): |
Total Authors: 2
|
| Affiliation: | [1] Inst Nacl Pesquisas Espaciais, Lab Associado & Sensores & Mat, BR-12227010 Sao Jose Dos Campos - Brazil
[2] Ist Nazl Fis Nucl, Sez Pavia, Milan - Italy
[3] Univ Insubria, Dipartimento Matemat & Fis, I-22100 Como - Italy
Total Affiliations: 3
|
| Document type: | Journal article |
| Source: | PHYSICA B-CONDENSED MATTER; v. 404, n. 19, p. 2916-2919, OCT 15 2009. |
| Web of Science Citations: | 1 |
| Abstract | |
A quantum pseudo-spin model with random spin sizes is introduced to study the effects of charging-energy disorder on the superconducting transition in granular superconducting materials. Charging-energy effects result from the small electrical capacitance of the grains when the Coulomb charging energy is comparable to the Josephson-coupling energy. In the pseudo-spin model, randomness in the spin size is argued to arise from the inhomogeneous grain-size distribution. For a particular bimodal spin-size distribution, the model describes percolating granular superconductors. A mean-field theory is developed to obtain the phase diagram as a function of temperature, average charging energy and disorder. (C) 2009 Elsevier B.V. All rights reserved. (AU) | |
| FAPESP's process: | 07/08492-9 - Dynamics, topological defects and phase transitions in ordered media |
| Grantee: | Enzo Granato |
| Support Opportunities: | Research Projects - Thematic Grants |