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

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

1995-04-08

arxiv.org/abs/cond-mat/9504031v1

Physics

Condensed Matter

4 pages, self-unpacking uuencoded compressed postscript file with figures already inside text; to appear in Phys. Rev. Lett.(1

Scientific paper

10.1103/PhysRevLett.74.4919

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 $T^*\sim j_c^{3/2}$. I argue that due to interactions between flux lines there exist three relaxation regimes, depending on whether $BB_\phi$, 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.

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