Abstract
An experimental study of macroturbulence in a superconducting YBCO single crystal is carried out. This macroturbulent instability arises upon a change of sign of the external magnetic field, resulting in the formation of a magnetization-reversal front, which divides the sample into regions occupied by vortices with opposite orientation (vortices and antivortices). The measurements are made by magnetooptical methods at a temperature of 40K. It is found that the development time of the macroturbulence depends substantially on the value of the external magnetic field H. With increasing H the macroturbulent process, which is accompanied by annihilation of vortices and antivortices, is accelerated on account of enhancement of the magnetic flux creep.
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