nd - m at . s up r - co n ] 2 9 Ju l 1 99 9 Hall tunneling of vortices in superclean superconductors
نویسندگان
چکیده
We discuss the main features of Hall tunneling of pancake vortices in super-clean high-T c superconductors. The general formalism for the calculation of the lifetime of a vortex pinned in a metastable configuration is described. The results are applied to the problem of quantum tunneling of a pancake vortex from a columnar defect in the limit of a small driving current. An external magnetic field penetrates a type-II superconductor in the form of vortices — flux tubes enclosing a quantum Φ 0 = πc/e of magnetic flux. The new class of high temperature superconductors exhibits a large variety of vortex related phenomena, which can be tuned by specific material parameters 1 , e.g., the material anisotropy and the macroscopic and microscopic amount of disorder, the former determining vortex pinning, whereas the latter is responsible for the vortex dynamics. Here we are interested in highly anisotropic (layered) clean material. A single vortex then can be represented as a chain of pancake vortices. The (low frequency) vortex equation of motion takes the form Φ 0 c j ∧ n − ∇U pin = ηv + m ˙ v + αv ∧ n,
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