Effect of oxygen content on flux pinning in Nd-Ba-Cu-O single crystals

Author

Feng, Y. ; Pradhan, A.K. ; Shibata, S. ; Machi, T. ; Koshizuka, N.

Author_Institution

Supercond. Res. Lab., ISTEC, Tokyo, Japan

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

3639

Lastpage

3642

Abstract

The magnetization of NdBa₂Cu₃O_y single crystals with various oxygen contents was investigated by superconducting quantum interference device (SQUID) magnetometer over a wide range of temperature and field. The results clearly indicate that the peak effect and flux pinning can be easily adjusted by changing the oxygen content in this material. Although the peak field decreases with increasing the amount of oxygen vacancies, J_c is significantly improved in the low fields and the peak effect becomes more pronounced. The oxygen vacancy clusters are very effective pinning centers and dominate the flux pinning in the sample subjected to the annealing and quenching process at 400°C

Keywords

annealing; barium compounds; critical current density (superconductivity); flux pinning; high-temperature superconductors; magnetisation; neodymium compounds; quenching (thermal); stoichiometry; vacancies (crystal); 400 degC; HTSC; Nd-Ba-Cu-O; Nd-Ba-Cu-O single crystals; NdBa₂Cu₃O; NdBa₂Cu₃O_y; O content; SQUID magnetometer; annealing; critical current density; flux pinning; magnetization; oxygen vacancies; peak effect; pinning centers; quenching; Crystalline materials; Crystals; Flux pinning; Interference; Magnetic materials; Magnetization; SQUID magnetometers; Superconducting devices; Superconducting materials; Temperature distribution;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919853

Filename

919853