Abstract
The time dependence of flux patterns obtained on an untwinnedY Ba2Cu3O7−δ single crystal showing the ‘meandering instability’ is observed atT = 65 K using magneto-optical imaging. When applying a reversed external field to aremanent state, along the front of invading antiflux, macrovortices or droplets of fluxare formed, and eventually separate from the flux front in a spiral-like motion.The time-dependent behaviour of these macrovortices is investigated in detail.
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