A.B. McLean, R.H. Williams
Journal of Physics C: Solid State Physics
Hall-probe measurements of an YBa2Cu3O7- crystal in the range 0.11 K show a temperature-independent time-logarithmic magnetic relaxation. These results rule out conventional thermally activated flux creep, which predicts a T2/3 dependence at the lowest temperatures if one takes into account the dependence of the barrier on driving force in a simple one-dimensional model. They are consistent with a phenomenological theory assuming a quantum tunneling process for vortex kink motion. © 1991 The American Physical Society.
A.B. McLean, R.H. Williams
Journal of Physics C: Solid State Physics
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