Investigation into microwave power dependence of high quality Tl-1223 thin films on LSAT substrate

Author

Jacob, Mohan V. ; Sundaresan, A. ; Mazierska, J. ; Tanaka, Y.

Author_Institution

Sch. of Eng., James Cook Univ. of North Queensland, Townsville, Qld., Australia

Volume

15

Issue

2

fYear

2005

fDate

6/1/2005 12:00:00 AM

Firstpage

3596

Lastpage

3599

Abstract

The microwave power dependence of high quality Tl(Ba,Sr)₂Ca₂Cu₃O_y thin films grown on 1´´ diameter LSAT substrates using the Amorphous Phase Epitaxy method has been investigated in this paper. We have performed surface resistance (R_S) measurements of Tl-1223 thin films on LSAT using the Hakki-Coleman sapphire dielectric resonator technique in the temperature range 15-94 K. High accuracy in measurements was achieved by using the multi-frequency Transmission Mode Q-Factor Technique. The Tl-1223 films exhibited low surface resistance comparable to YBCO films. When RF power levels were increased the onset of nonlinearity was observed at 0 dBm for all measured temperatures (17, 50, 70 and 84 K).

Keywords

barium compounds; calcium compounds; high-frequency effects; high-temperature superconductors; strontium compounds; superconducting epitaxial layers; surface conductivity; thallium compounds; 15 to 94 K; Hakki-Coleman sapphire dielectric resonator; LSAT substrate; Tl(BaSr)₂Ca₂Cu₃O_y; YBCO films; amorphous phase epitaxy; high temperature superconductors; microwave power dependence; multifrequency transmission mode Q-factor technique; surface resistance measurements; thallium-1223 thin films; Amorphous materials; Dielectric measurements; Dielectric substrates; Dielectric thin films; Electrical resistance measurement; Epitaxial growth; Microwave theory and techniques; Surface resistance; Temperature measurement; Transistors; High temperature superconductors; Tl-1223; microwave properties; surface resistance;

fLanguage

English

Journal_Title

Applied Superconductivity, IEEE Transactions on

Publisher

ieee

ISSN

1051-8223

Type

jour

DOI

10.1109/TASC.2005.849368

Filename

1440449