Quantum vortex creep :Hall and dissipative tunneling
  Within the framework of the path-integral approach we study the quantum vortex creep for the situation where both the Hall and the dissipative dynamics are simultaneously present. We calculate the relaxation rate and the crossover temperature separating the thermal activation and the quantum tunneling processes for anisotropic or multilayer superconductors. The results are compared with the available experimental data. 
Gwang-Hee Kim and Mincheol Shin