Vortex imaging in amorphous Mo₈₀Ge₂₀ pentagons

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• 作者：Ho Thanh Huy ; Masaru Kato ; Osamu Sato ; Masahiko Hayashi ; Tsutomu Yotsuya ; Takekazu Ishida
• 关键词：Vortex states ; Geometrical confinement ; Amorphous MoGe film ; SQUID microscope
• 刊名：Physica C
• 出版年：2013
• 出版时间：15 November, 2013
• 年：2013
• 卷：494
• 期：Complete
• 页码：99-101
• 全文大小：774 K

文摘

We present the direct observation of vortex configuration in Mo₈₀Ge₂₀ pentagons using the scanning SQUID microscope. Systematic measurements allow us to reveal how vortices are confined in a restricted sample as well as how vortex arrangement evolves with increasing the applied magnetic field. Vortex distribution in pentagon tends to take one of five symmetric axes of pentagon expected from sample geometry. We found that the rule of shell filling is different among various different sizes of the pentagons. For vorticity of six, vortices form a two-shell structure in small pentagon, while single shell structure in larger pentagon. We also demonstrate that the vortex dragging effect can be caused by the superconducting pick-up coil in a weak pinning specimen.