Inverted-parabolic and weak strain dependencies on the critical current in practical
110
and
100
oriented REBCO tapes
実用的な
110
および
100
指向のREBCOテープの臨界電流に対する逆放物線および弱いひずみ依存性
長村 光造*; 町屋 修太郎*; 梶原 堅太郎*; 川崎 卓郎
; Harjo, S.
; Zhang, Y.*; 藤田 真司*; 飯島 康裕*; Hampshire, D. P.*
Osamura, Kozo*; Machiya, Shutaro*; Kajiwara, Kentaro*; Kawasaki, Takuro; Harjo, S.; Zhang, Y.*; Fujita, Shinji*; Iijima, Yasuhiro*; Hampshire, D. P.*
In the commercial coated conductor tapes, the twinned structure of REBCO (REBa
Cu
O
, RE = Y and Gd) is characterized as either
100
or
110
orientation based on the tape length direction. In this study, we investigate the effects of the two different twinned structures on the critical current
of the REBCO tapes by combining; transport critical current and synchrotron radiation diffraction measurements. For the tapes with
100
oriented twins, we observed the inverted parabolic strain behavior on the uniaxial strain dependence of
. In contrast, the ones with
110
oriented twins showed a weak strain behavior without any maximum appeared in the strain dependence. Such a different uniaxial strain dependence was analyzed by using the one-dimensional twin model with different fractional lengths of A-domains and B-domains of REBCO twins. This model explains the essential features of the different uniaxial strain dependence we observed.