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

Mladen Prester

doi:10.1103/PhysRevB.60.3100

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

Mladen Prester

DOI 10.1103/PhysRevB.60.3100 · Physical Review B

T1

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Abstract

We report on our experimental evidence of a substantial geometrical ingredient characterizing the problem of incipient dissipation in high-Tc superconductors (HTS’s): high-resolution studies of differential resistance-current characteristics in the 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 a critical-phenomena scenario as a model for dissipation in inhomogeneous and disordered HTS’s, 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’s.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
GdBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown
RBa2Cu3O7-x Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown