Angular behaviour of critical current density in YBa2Cu3Oy thin films with crossed columnar defects

T. Sueyoshi, T. Sogo, T. Nishimura, T. Fujiyoshi, F. Mitsugi, T. Ikegami, S. Awaji, K. Watanabe, A. Ichinose, N. Ishikawa

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18 Citations (Scopus)


Columnar defects (CDs) were installed into YBa2Cu3Oy thin films at the crossing angle ± θ i relative to the c-axis using 200 MeV Xe ions, in order to clarify the influence of ± θ i on the angular behaviours of critical current density J c. The width of a J c peak occuring at B || c linearly increases with broadening CD-crossing angle, where its shape maintains a single peak in the range of θ i ≤ ± 25°. The CDs crossing at ± 45°, on the other hand, drastically change the angular behaviour of J c around B || c: the J c is equally elevated over the angular region from -45° to 45° in the lower magnetic field, whereas the rapid reduction of the J c occurs at B || c with increasing magnetic field, leading to the appearance of double peaks near the irradiation angles, ± 45°. This crossover phenomenon is attributed to the difference in the pinned states of flux lines between B || c and at the irradiation angles: the CDs crossing at ± 45° cannot provide the correlated flux pinning along the c-axis, resulting in the uncorrelated pinned state at B || c.

Original languageEnglish
Article number065023
JournalSuperconductor Science and Technology
Issue number6
Publication statusPublished - 2016 May 12


  • columnar defects
  • critical current density
  • flux pinning
  • irradiation


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