Thermally activated Hall creep of flux lines from a columnar defect

Abstract

We analyse the thermally activated depinning of an elastic string (line tension $\epsilon$) governed by Hall dynamics from a columnar defect modelled as a cylindrical potential well of depth $V_0$ for the case of a small external force $F.$ An effective 1D field Hamiltonian is derived in order to describe the 2D string motion. At high temperatures the decay rate is proportional to $F^{5/2}{T}^{-1/2}\exp \left[F_0/F-U(F)/T\right],$ with $F_0$ a constant of order of the critical force and $U(F) \sim{\left ({εV_{0}})}^{{1}/{2}}{V_{0}/{F}}$ the activation energy. The results are applied to vortices pinned by columnar defects in superclean superconductors.

12 pages, RevTeX, 2 figures inserted

References in corpus (2)

• Decay of Metastable States: Sharp Transition from Quantum to Classical Behavior
• Quantum depinning of a pancake-vortex from a columnar defect

Cited by in corpus (3)

• Quantum depinning of a pancake-vortex from a columnar defect
• Metastability of (d+n)-dimensional elastic manifolds
• Deppining of a Superfluid Vortex Inside a Circular Defect