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

Abstract

I show that in Bose Glass superconductor with high $j_c$ and at low $T$ the magnetization relaxation (S), dominated by quantum tunneling, is $\propto {\sqrt{j}}_c$, which crosses over to the conventional classical rate $\propto T/j_c$ at higher $T$ and lower $j_c$, with the crossover $T^{\ast }\sim j_c^{3/2}$. I argue that due to interactions between flux lines there exist three relaxation regimes, depending on whether $B<B_{\varphi }$, $B\approx B_{\varphi }$, $B>B_{\varphi }$, corresponding to Strongly-pinned Bose Glass (SBG) with large $j_{c2}$, Mott Insulator (MI) with vanishing S, and Weakly-pinned Bose Glass (WBG) characterized by small $j_{c1}$. I discuss the effects of interactions on $j_c$ and focus attention on the recent experiment which is consistently described by the theory.

4 pages, self-unpacking uuencoded compressed postscript file with figures already inside text; to appear in Phys. Rev. Lett.(1995)

References in corpus (1)

• Tunneling of a Quantized Vortex: Roles of Pinning and Dissipation

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• Weakly Pinned Bose Glass vs. Mott Insulator Phase in Superconductors
• Properties of the Bose glass phase in irradiated superconductors near the matching field
• Vortices in layered superconductors with columnar pins: A density functional study
• Effect of Vortex Screening on the Bose Glass to Entangled Liquid Transition of Flux Lines in Superconductors