LOW TEMPERATURE MAGNETIC FORCE MICROSCOPY STUDY OF VORTEX IN A YBa_2Cu_3O_(7-x) THIN FILM

摘要

A low temperature magnetic forc micro-scope for the study of high temperature superconductor isdeveloped. It has been applied to spatially resolve singlevortices at low temperature （77K） in a YBa2Cu3,O7-x. thinfilm deposited by laser ablation on a NdGaO3 substrate.The images of disordered vortex arrangements are obtained. The movement of single vortices after a contactmode scanning of the detecting tip over the thin film sur-face is observed. The reason for the movement is dis-cussed.