Dynamics of Flux Creep in Underdoped Single Crystals of Y₁-xPr_xBa₂Cu₃O₇-d

T. Stein , G. A. Levin , C. C. Almasan (a) D. A. Gajewski , M. B. Maple (b) ((a)Department of Physics , Kent State University (b)Department of Physics , Institute for Pure , Applied Physical Sciences , University of California at San Diego)

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classification ❄️ cond-mat.supr-con

keywords transitioncouplingcreepbelowcrystalscurrentdistributionmixed

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Transport as well as magnetic relaxation properties of the mixed state were studied on strongly underdoped Y_1-xPr_xBa_2Cu_3O_7-d crystals. We observed two correlated phenomena - a coupling transition and a transition to quantum creep. The distribution of transport current below the coupling transition is highly nonuniform, which facilitates quantum creep. We speculate that in the mixed state below the coupling transition, where dissipation is nonohmic, the current distribution may be unstable with respect to self-channeling resulting in the formation of very thin current-carrying layers.

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Dynamics of Flux Creep in Underdoped Single Crystals of Y₁-xPr_xBa₂Cu₃O₇-d

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