Quantum Creep in Y1-xPrxBa2Cu3O7$ Crystals: Magnetic Relaxation and Transport
T. Stein, G. A. Levin, C. C. Almasan, D. A. Gajewski, M. B. Maple
Abstract
We report transport and magnetic relaxation measurements in the mixed state of strongly underdoped Y1-xPrxBa2Cu3O7 crystals. A transition from thermally activated flux creep to temperature independent quantum flux creep is observed in both transport and magnetic relaxation at temperatures T * 5 K. Flux transformer measurements indicate that the crossover to quantum creep is preceded by a coupling transition. Based on these observations we argue that below the coupling transition the current is confined within a very narrow layer beneath the current contacts.
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