Magnetization Relaxation via Quantum and Classical Vortex Motion in a Bose Glass Superconductor

Abstract

I show that in a Bose glass superconductor with high jc and at low T the magnetization relaxation ( S), dominated by quantum tunneling, is ∝jc, which crosses over to the conventional classical rate ∝T/jc at higher T and lower jc, with the crossover T*∼jc3/2. I argue that due to interactions between flux lines there exist three relaxation regimes, depending on whether B<Bφ, B≈Bφ, B>Bφ, corresponding to strongly pinned Bose glass with large jc2, Mott insulator with vanishing S, and weakly pinned Bose glass characterized by small jc1. I discuss the effects of interactions on jc and focus attention on a recent experiment which is consistently described by the theory.

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