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

Sueyoshi, Tetsuro*; Sogo, Takehiro*; Nishimura, Takahiro*; Fujiyoshi, Takanori*; Mitsugi, Fumiaki*; Ikegami, Tomoaki*; Awaji, Satoshi*; Watanabe, Kazuo*; Ichinose, Ataru*; Ishikawa, Norito   

Columnar defects (CDs) were installed into YBaCuOy thin films at the crossing angle relative to the c-axis using 200 MeV Xe ions. The width of a Jc peak occurring around B//c linearly increases with broadening the CD-crossing angle, where its shape maintains a single peak in the small angle range. The CDs crossing at 45, on the other hand, drastically change the angular behaviour of Jc around B//c, the Jc is equally elevated over the angular region from -45 to +45 in lower magnetic field, whereas the rapid reduction of the Jc around B//c occurs with increasing the magnetic field, leading to the appearance of double peaks at the irradiation angles, -45 and +45.