Quantum vortex creep :Hall and dissipative tunneling
نویسندگان
چکیده
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. PACS number(s): 74.60.Ge
منابع مشابه
Thermally Assisted Quantum Vortex Tunneling in the Hall and Dissipative Regime
Quantum vortex tunneling is studied for the case where the Hall and the dissipative dynamics are simultaneously present. For a given temperature, the magnetization relaxation rate is calculated as a function of the external current and the quasiparticle scattering time. The relaxation rate is solved analytically at zero temperature and obtained numerically at finite temperatures by the variatio...
متن کاملExactly solvable model of dissipative vortex tunneling
I consider the problem of vortex tunneling in a two-dimensional superconductor. The vortex dynamics is governed by the Magnus force and the Ohmic friction force. Under-barrier motion in the vicinity of the saddle point of the pinning potential leads to a model with quadratic Hamiltonian which can be analytically diagonalized. I find a non-monotonic dependence of the tunneling probability on the...
متن کاملMagnetic relaxation of superconducting quantum dot: two-dimensional false vacuum decay
Quantum tunneling of vortices has been found to be an important novel phenomena for description of low temperature creep in high temperature superconductors (HTSCs). We speculate that quantum tunneling may be also exhibited in mesoscopic superconductors due to vortices trapped by the Bean-Livingston barrier. The London approximation and method of images is used to estimate the shape of the pote...
متن کاملDiamagnetism and flux creep in bilayer exciton superfluids
We discuss the diamagnetism induced in an isolated quantum Hall bilayer with total filling factor νT = 1 by an in-plane magnetic field. This is a signature of counterflow superfluidity in these systems. We calculate magnetically induced currents in the presence of pinned vortices nucleated by charge disorder, and we predict a history-dependent diamagnetism that could persist on laboratory time ...
متن کاملGeneral Features of Quantum Creep in High-Tc Superconductors
Measurements of the relaxation rate QsT d of superconducting currents have been performed on a carefully selected set of dirty and clean high-Tc superconductors for temperatures T down to 100 mK and magnetic fields up to 7 T. The extrapolated relaxation rates Qs0d for the dirty compounds indicate that the viscosity experienced by a tunneling vortex segment is grossly underestimated by the stand...
متن کاملذخیره در منابع من
با ذخیره ی این منبع در منابع من، دسترسی به آن را برای استفاده های بعدی آسان تر کنید
عنوان ژورنال:
دوره شماره
صفحات -
تاریخ انتشار 1998