113 citations · 387 across the 13 of their papers we have counts for
13 papers
Finite-size effect of critical penetration of Pearl vortices in narrow superconducting flat rings
N. Kokubo, S. Okayasu, T. Nojima
We revisit the critical penetration of Pearl vortices in narrow superconducting flat rings cooled in magnetic fields. Scanning superconducting quantum interference device microscop…
Macroscale three-dimensional proximity effect in disordered normal/superconductor nanocomposites
Katsuya Ueno, Nobuhito Kokubo, Satoru Okayasu +8
Recently, interest in Superconductor (S)-Normal (N) interfaces was renewed by the observation of exotic proximity effects in various systems, including S/semiconductor, S/ferromagn…
Commensurate and Incommensurate Vortex States Confined in Mesoscopic Triangles of Weak Pinning Superconducting Thin Films
Nobuhito Kokubo, Hajime Miyahara, Satoru Okayasu +1
We report on the direct observation of vortex states confined in equilateral and isosceles triangular dots of weak pinning amorphous superconducting thin films with a scanning supe…
Flow and Tilt-Induced Orientation of the Moving Vortex Lattice in Amorphous NbGe Superconducting Thin Films
Nobuhito Kokubo, Tetsuya Yoshimura, Bunjyu Shinozaki
The orientation and deformation of moving vortex lattices in the flux-flow state have been investigated in amorphous superconducting NbGe thin films. Employing a mode-locking techn…
Scanning SQUID Microscope Study of Vortex Polygons and Shells in Weak Pinning Disks of an Amorphous Superconducting Film
Nobuhito Kokubo, Satoru Okayasu, Akinobu Kanda +1
Direct observation of vortices by the scanning SQUID microscopy was made on large mesoscopic disks of an amorphous MoGe thin film. Owing to the weak pinning nature of the amorphous…
Dynamic ordering of driven vortex matter in the peak effect regime of amorphous MoGe films and 2H-NbSe2 crystals
N. Kokubo, T. Asada, K. Kadowaki +3
Dynamic ordering of driven vortex matter has been investigated in the peak effect regime of both amorphous MoGe films and 2H-NbSe2 crystals by mode locking (ML) and dc transport me…