Vortex images of superconducting material Tl-1223 thin film taken with a scanning SQUID microscope are presented. Among the vortices images, coexistence of vortex–antivortex pairs is observed at low field region. Short distances of the pairs indicate the existence of strong pinning centers in this material.
Pinning properties of superconducting material Tl-1223 thin film are investigated. Vortex images are compared between a pristine and high-energy gold ion irradiated sample. This comparison implies which pinning center is effective for this material between large pinning centers and columnar defect. Large pinning centers are better for this material.
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