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Sueyoshi, Tetsuro*; Nishimura, Takahiro*; Fujiyoshi, Takanori*; Mitsugi, Fumiaki*; Ikegami, Tomoaki*; Ishikawa, Norito
Superconductor Science and Technology, 29(10), p.105006_1 - 105006_7, 2016/10
Times Cited Count：12 Percentile：42.54(Physics, Applied)A systematic investigation of flux pinning by widely direction-dispersed columnar defects (CDs) in YBa
Cu
Oy thin films was carried out by using heavy-ion irradiation: a parallel configuration of CDs aligned along the 
-axis, and two trimodal splay configurations composed of crossing CDs; relative to the -axis, where the splay plane defined by the three irradiation angles is perpendicular (trimodal-A) or parallel (trimodal-B) to the transport current direction. The trimodal configurations show high pinning efficiency over a wide range of magnetic field orientations compared to the parallel one at low magnetic field. In particular, trimodal-B shows the higher critical current density of the two trimodal configurations.
CuOy thin films with crossed columnar defectsSueyoshi, Tetsuro*; Sogo, Takehiro*; Nishimura, Takahiro*; Fujiyoshi, Takanori*; Mitsugi, Fumiaki*; Ikegami, Tomoaki*; Awaji, Satoshi*; Watanabe, Kazuo*; Ichinose, Ataru*; Ishikawa, Norito
Superconductor Science and Technology, 29(6), p.065023_1 - 065023_8, 2016/05
Times Cited Count：21 Percentile：61.14(Physics, Applied)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.
