Anisotropy Improvement of Critical Current Density in Bi-based Superconductor by Mg Impurity Doping

Author

Tanaka, H. ; Araki, Y. ; Yoshikawa, H. ; Kishida, S.

Author_Institution

Nat. Inst. of Technol., Yonago Coll., Yonago, Japan

Volume

25

Issue

3

fYear

2015

fDate

Jun-15

Firstpage

1

Lastpage

4

Abstract

We investigated effects of Mg impurity doping on Bi₂Sr₂CaCu₂O_y high-temperature superconductor (Bi-2212 HTS). We used Bi-2212 HTS whisker as a sample and tried to improve its anisotropy of critical current density (J_c). For the Mg-doping, we adopted thermal diffusion process. In the process, nonsuperconducting phase is expected to appear on the surface of the whisker. From experimental results, we found that the anisotropy parameter of J_c can be improved from 13.8 to 1.89 by doping Mg impurity with 400 °C annealing.

Keywords

annealing; bismuth compounds; calcium compounds; critical current density (superconductivity); doping; high-temperature superconductors; strontium compounds; thermal diffusion; whiskers (crystal); Bi-2212 high-temperature superconductor whisker; Bi₂Sr₂CaCu₂O_y; Mg impurity doping effects; anisotropy parameter; annealing; critical current density; nonsuperconducting phase; temperature 400 degC; thermal diffusion process; whisker surface; Anisotropic magnetoresistance; Annealing; Doping; High-temperature superconductors; Impurities; Magnetic field measurement; Magnetic fields; Bi-2212 high temperature superconductor; critical current; pinning center; whisker;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2015.2395148

Filename

7017486