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We have observed the vortex creep in high magnetic field up to 4T at low temperature of 0.45K in a type II superconductor YNi2B2C by scanning tunneling microscopy. The measurement time for one STM image was about 15s. The fast STM measurements enable the observation of vortex motions in real time and space. Vortex lattices in high magnetic field have been found to be divided into vortex bundles separated...
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