2007/07/24 by V. R. Misko, Bo Xu, B. Xu +1 · 1 citation
Engineering · Physics and Astronomy · #Physics of Superconductivity and Magnetism #Quantum, superfluid, helium dynamics #Superconducting Materials and Applications #cond-mat.supr-con
paper · pdf · doi:10.1103/physrevb.76.024516
published as Phys. Rev. B 76, 024516 (2007) · 12 pages, 1 table, 12 figures
openalex publication_date 2007/07/24 · arxiv created 2008/04/10 · arxiv updated 2009/12/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/30
Recent experiments [I. V. Grigorieva et al., Phys. Rev. Lett. 96, 077005 (2006)] on visualization of vortices using the Bitter decoration technique revealed vortex shells in mesoscopic superconducting Nb disks containing up to L=40 vortices. Some of the found configurations did not agree with those predicted theoretically. We show here that this discrepancy can be traced back to the larger disks with radii R\ensuremath∼1--2.5\phantom\rule0.3em0ex\ensuremathμm, i.e., R\ensuremath∼50--100\ensuremathξ(0) used in the experiment, while in previous theoretical studies, vortex states with vorticity L\ensuremath\leqslant40 were analyzed for smaller disks with R\ensuremath∼5--20\ensuremathξ(0). The present analysis is done for thin disks (mesoscopic regime) and for thick (macroscopic) disks where the London screening is taken into account. We found that the radius of the superconducting disk has a pronounced influence on the vortex configuration in contrast to, e.g., the case of parabolic confined charged particles. The missing vortex configurations and the region of their stability are found, which are in agreement with those observed in the experiment.