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Description:

In type-II/1 superconductors, the intervortex interaction has a potential minimum, resulting in
an attractive force at certain distances. To better understand this unique vortex system, in-situ
observations in high-purity Nb have been performed using magneto-optical imaging with singlevortex resolution. We have dynamically visualized the behavior of the vortices during cooling,
including clustering of attractively interacting single vortices, the hopping motion of vortices, the
formation of an Abrikosov triangular lattice, and various degrees of disordered states with or without
clusters. From the direct observations of clustering vortices, a conversion temperature for the
boundary between type-II/2 and type-II/1 states is evaluated. The diverse vortex configurations
arise from the interplay of the vortex-vortex interaction, the screening current, and the pinning
potential landscape.

Rights:

• In Copyright
  

  ©2025 American Physical Society

Keyword: vortex, superconductivity, niobium, type-II/1 superconductor, magneto-optical imaging

Date published: 2025-03-19

Publisher: Physical Review Journals

Journal:

• PHYSICAL REVIEW B (ISSN: 24699950) vol. 111 issue. 9

Funding:

• JSPS 23K03329 (Type-II/1 超伝導遷移領域における特異な磁束状態のリアルタイム観察)
• JSPS 21K04145 (マルチゲート構造を持つ超伝導電界効果トランジスタの研究)

Manuscript type: Author's version (Accepted manuscript)

MDR DOI: https://doi.org/10.48505/nims.5385

First published URL: https://doi.org/10.1103/PhysRevB.111.094519

Related item:

• is_supplemented_by
• Dynamical visualization of attractively interacting single vortices in type-II/1 superconducting Nb by magneto-optical imaging (dataset)
• https://doi.org/10.48505/nims.5348

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Updated at: 2025-04-08 13:16:22 +0900

Published on MDR: 2025-04-07 22:17:48 +0900