Experimental test of the self-organized criticality of vortices in superconductors

V. K. Vlasko-Vlasov; U. Welp; V. Metlushko; G. W. Crabtree

doi:10.1103/PhysRevB.69.140504

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Experimental test of the self-organized criticality of vortices in superconductors

V. K. Vlasko-Vlasov, U. Welp, V. Metlushko, G. W. Crabtree

DOI 10.1103/PhysRevB.69.140504 · Physical Review B

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Abstract

Magneto-optical studies of the vortex dynamics in Nb films reveal stochastic jumps of flux bundles forming a rough penetration front. The scaling analysis of the width, correlation function, and the length of flux profiles behind the front retrieves the roughness exponents and Housdorff dimension characterizing the self-organized critical state. The exponents correspond to (1+1)-dimensional nonlinear diffusion in systems with quenched disorder and long-range correlations. The power spectra of the profiles confirm the self-affine character of the dynamically formed critical state.

Source-reported materials — not catalogue approval

Formula	Reported Tc (K)	Pressure (GPa)	Type
Nb Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	8.5	Pressure not reported	unknown
YBa2Cu3O7-δ Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula.	—	Pressure not reported	unknown