[15a-D704-1~10] 10.5 Application of magnetic field

[15a-D704-3] In-situ X-ray diffraction study on orientation of biaxial crystal
Y₂Ba₄Cu₇Oy (14<y<15) under magnetic fields

〇Fumiko Kimura¹, Shintaro Adachi¹, Walid Bin Ali¹, Shigeru Horii¹, Tsunehisa Kimura² (1.KUAS, 2.FUT)

Keywords:conductor, magnetic orientation, X-ray diffraction

REBa₂Cu₃O_y (RE123, RE: rare earth, y=6~7), which has a high critical temperature (T_c) above liquid nitrogen temperature and a high critical current density (J_c) in magnetic field, requires biaxial crystal orientation for practical use. We have been useing the magnetic orientation based on the magnetic susceptibility anisotropy of crystals. However, RE123 forms twin structure during the fabrication process, and the ratio of twins is not constant. On the other hand, Y₂Ba₄Cu₇O_y (Y247, y=14~15) does not form twins and is suitable for observing orientation behavior under magnetic fields.
The orientation behavior of uniaxial crystals under static and rotating magnetic fields has been studied. On the other hand, the equation of motion for uniaxial orientation of biaxial crystals has only been studied by solving numerically. The orientation behavior of biaxial crystals under a rotating magnetic field has not been experimentally investigated in detail. In this report, we investigate the orientation behavior of Y247 under a rotating magnetic field for the application of RE123 to biaxial crystals.