Preparation of superconductive Y-Ba-Cu-O/Bi-Sr-Ca-Cu-O heteroepitaxial bilayer films by Nd:YAG laser ablation

Author

Uchiyama, Tetsuji ; Wang, Zhen

Author_Institution

Commun. Res. Lab., Kansai Adv. Res. Center, Kobe, Japan

Volume

11

Issue

1

fYear

2001

fDate

3/1/2001 12:00:00 AM

Firstpage

3297

Lastpage

3300

Abstract

Here we report for the first time the heteroepitaxial growth of as-deposited superconductive YBa₂Cu₃O_7-x (YBCO)/Bi₂Sr₂CaCu₂O_8-y (Bi-2212) and Bi-2212/YBCO bilayer films on MgO (100) substrates by using the 4th harmonics of a Nd:YAG pulsed laser beam. The Bi-2212 thin films had single-phase crystallinity and a zero resistance temperature (T_c0) of 71.4 K. Under similar preparation conditions, YBCO thin films showed single phase and T_c0=88.5 K. The YBCO/Bi-2212 bilayer films grown with an in situ process´ showed c-axis orientation and single phase for both YBCO and Bi-2212, Moreover, X-ray pole figures indicated that YBCO/Bi-2212 and Bi-2212/YBCO bilayer films grow heteroepitaxially with in-plane orientation of the Bi-2212 [100] direction parallel to the [110] direction of YBCO

Keywords

barium compounds; bismuth compounds; calcium compounds; crystal orientation; high-temperature superconductors; interface structure; pulsed laser deposition; strontium compounds; superconducting epitaxial layers; superconducting transition temperature; vapour phase epitaxial growth; yttrium compounds; 4th harmonic; 71.4 K; 88.5 K; Bi-2212; Bi-2212/YBCO bilayer films; Bi₂Sr₂CaCu₂O_8-y; MgO; MgO (100) substrates; Nd:YAG laser ablation; X-ray pole figures; YBCO; YBa₂Cu₃O_7-x; YBa₂Cu₃O₇-Bi₂Sr₂CaCu₂O₈; as-deposited superconductive YBa₂Cu₃O_7-x/Bi₂Sr₂CaCu₂O_8-y bilayer films; c-axis orientation; heteroepitaxial growth; in-plane orientation; single-phase crystallinity; superconductive Y-Ba-Cu-O/Bi-Sr-Ca-Cu-O heteroepitaxial bilayer films; zero resistance temperature; Bismuth; Crystallization; Laser beams; Optical pulses; Poles and zeros; Strontium; Substrates; Superconductivity; Transistors; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/77.919767

Filename

919767