Crystal Growth of Ba Concentration Controlled YBCO Films by TFA-MOD Process

Author

Teranishi, Ryo ; Tada, K. ; Yoshida, J. ; Yamada, K. ; Mori, N. ; Mukaida, M. ; Nakaoka, K. ; Miura, M. ; Yoshizumi, M. ; Izumi, T. ; Shiohara, Y.

Author_Institution

Kyushu Univ., Fukuoka, Japan

Volume

19

Issue

3

fYear

2009

fDate

6/1/2009 12:00:00 AM

Firstpage

3200

Lastpage

3203

Abstract

YBCO films grown by the starting solution with Ba-poor (cation ratio as Y:Ba:Cu = 1:1.5:3) have been reported to have higher J _c than that for YBCO films with stoichiometric composition due to smaller and less pores in TFA-MOD YBCO. In this study, Ba concentration in the Ba-poor YBCO films was controlled in film thickness direction, and influences of the Ba concentration gradient on microstructures and J _c properties were investigated to realize higher J _c. Precursor films with Ba-poor composition and with Ba-rich composition in the thickening direction were prepared and then the films were crystallized. Increasing the Ba concentration in thickening direction led to higher J _c than that of Ba-poor YBCO. Cross sectional TEM observations showed that the effective YBCO thickness increased for YBCO film with higher Ba concentration in comparison to the previous Ba-poor YBCO film.

Keywords

barium compounds; critical current density (superconductivity); crystallisation; high-temperature superconductors; liquid phase deposition; stoichiometry; superconducting thin films; transmission electron microscopy; yttrium compounds; TFA-MOD process; YBCO films; YBa₂Cu₃O_7-delta; critical current density; cross sectional TEM; crystal growth; crystallization; microstructures; stoichiometric composition; trifluoroacetate metal organic deposition; Critical current density; YBCO film; metal organic deposition; microstructure; trifluoroacetate;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2009.2017958

Filename

5153151