[17p-D209-1~8] 11.1 Fundamental properties

[17p-D209-3] Observation of a single vortex and vortex clustering in high purity Nb by magneto-optical imagings

〇Minoru Tachiki¹, Shuuichi Ooi¹, Takashi Mochiku¹, Hayato Ito², Akihiro Kikuchi¹, Shunichi Arisawa¹, Takayuki Kubo², Kensei Umemori² (1.NIMS, 2.KEK)

Keywords:vortex, superconducting cavity, magneto-optical microscope

High-purity niobium is a Type-II/1 superconductor with a Ginzburg-Landau parameter close to the boundary value of Type I and Type II superconductors. And it shows characteristic vortex behaviors. We directly observe the behavior of vortices and vortex clustering in the Type-II/1 niobium samples by magneto-optical microscope imaging.