Experimental evidence of a fractal dissipative regime in high-T_c superconductors

Details Experimental evidence of a fractal dissipative regime in high-T_c superconductors Experimental evidence of a fractal dissipative regime in high-T_c superconductors

1999-05-07

arxiv.org/abs/cond-mat/9905095v2

Physics

Condensed Matter

Superconductivity

5 pages, 3 figures, RevTex; Accepted for publication in Physical Review B; (figures enlarged)

Scientific paper

10.1103/PhysRevB.60.3100

We report on our experimental evidence of a substantial geometrical ingredient characterizing the problem of incipient dissipation in high-T_c superconductors(HTS): high-resolution studies of differential resistance-current characteristics in absence of magnetic field enabled us to identify and quantify the fractal dissipative regime inside which the actual current-carrying medium is an object of fractal geometry. The discovery of a fractal regime proves the reality and consistency of critical-phenomena scenario as a model for dissipation in inhomogeneous and disordered HTS, gives the experimentally-based value of the relevant finite-size scaling exponent and offers some interesting new guidelines to the problem of pairing mechanisms in HTS.

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