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The Superconductor Glasses (SuG). A Fractal Description
Author(s) -
Giovannella C.
Publication year - 1989
Publication title -
physica status solidi (b)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.51
H-Index - 109
eISSN - 1521-3951
pISSN - 0370-1972
DOI - 10.1002/pssb.2221540125
Subject(s) - fractal , fractal dimension , critical exponent , superconductivity , statistical physics , exponent , universality (dynamical systems) , condensed matter physics , renormalization group , fractal dimension on networks , spin glass , physics , materials science , mathematics , fractal analysis , mathematical physics , phase transition , mathematical analysis , linguistics , philosophy
It is shown that the value of the 1/Ψ critical exponent measured on sintered high‐ T c granular superconductors (La 1.85 Sr 0.15 CuO 4−δ and YBa 2 Cu 3 O 7−δ ) can be understood within the framework of a fractal model. Using the fractal cluster model, it is shown that under the hypothesis of ν = 1.33, the fractal dimension of these systems can be always straightforwardly derived. The comparison between the values of the SuG critical exponents and those of the spin glasses (SG) suggests the inclusion of both the ensembles of critical systems in a unique universality class whose definition differs from the usual one.