Vortex imaging of Tl-based superconductors with a scanning SQUID microscopy

Okayasu, Satoru; Nishio, Taichiro; Ono, Masao; Mashimo, Tsutomu; Tanaka, Yasutomo*; Iyo, Akira*

Physica C, 445-448, p.245 - 248, 2006/10

https://doi.org/10.1016/j.physc.2006.04.004

Vortex imagings of Tl-2223 thin film are achieved below Tc with a scanning SQUID microscope. Vortex arrangements are almost the same just below Tc, indicating the existence of strong pinning centers in the sample. The origin of the strong pinning centers comes from the morphological inhomogeneity on the surface.