Dynamics of Flux Creep in Underdoped Single Crystals of Y_1-xPr_xBa_2Cu_3O_7-d
T. Stein, G. A. Levin, and 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)
TL;DR
This study investigates flux creep dynamics in strongly underdoped Y_1-xPr_xBa_2Cu_3O_7-d crystals, revealing a coupling transition and quantum creep, with implications for current distribution and dissipation in the mixed state.
Contribution
It identifies the coupling transition and quantum creep phenomena in underdoped cuprate crystals, highlighting their effects on current distribution and dissipation mechanisms.
Findings
Observation of a coupling transition in flux dynamics
Detection of quantum creep in the mixed state
Nonuniform current distribution facilitates quantum creep
Abstract
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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