Microwave properties of large YBCO films on as-prepared and annealed MgO substrates

Author

Lee, J.H. ; Lim, J. ; Moon, S.H. ; Yun, J.H. ; Choi, Y.H. ; Oh, B. ; Sang Young Lee

Author_Institution

Dept. of Phys., Konkuk Univ., Seoul, South Korea

Volume

13

Issue

2

fYear

2003

fDate

6/1/2003 12:00:00 AM

Firstpage

2875

Lastpage

2878

Abstract

We have studied the microwave surface impedance of large YBCO films on as-prepared MgO substrates and on annealed MgO substrates with 50 mm in diameter. YBCO films were prepared by pulsed laser deposition. The surface resistance (R_S), homogeneity in the R_S, and structural properties of YBCO on annealed MgO appeared improved compared with those of YBCO on as-prepared MgO. The reduced R_S of YBCO films on annealed MgO is attributed to improved in-plane orientation of the YBCO grains in the films with local variations in the in-plane orientation of YBCO grains correlated well with the R_S for both YBCO films on as-prepared MgO and those on annealed MgO.

Keywords

annealing; barium compounds; crystal microstructure; high-frequency effects; high-temperature superconductors; magnesium compounds; microwave materials; substrates; superconducting thin films; surface impedance; yttrium compounds; 50 mm; MgO; YBCO grains; YBa₂Cu₃O₇; annealing; large YBCO films; microwave properties; microwave surface impedance; pulsed laser deposition; structure; surface resistance homogeneity; Annealing; High temperature superconductors; Microwave filters; Moon; Pulsed laser deposition; Substrates; Superconducting films; Superconducting filters; Surface resistance; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2003.812029

Filename

1212222