Conical cavity for surface resistance measurements of high temperature superconductors

Author

Mayer, Bernd ; Reccius, Andreas ; Knöchel, Reinhard

Author_Institution

Arbeitsbereich Hochfrequenztechnik, Tech. Univ., Hamburg-Harburg, Germany

Volume

40

Issue

2

fYear

1992

fDate

2/1/1992 12:00:00 AM

Firstpage

228

Lastpage

236

Abstract

A conically shaped cavity that intrinsically avoids mode-degeneration while maintaining the advantages of cylindrical resonators is presented. The cavity was applied to surface resistance measurements of YBaCuO thin films on MgO substrates at 18 GHz. The lowest measured value was 4.5 mΩ±2.1 mΩ for a 10 mm×10 mm laser ablated film at 77 K. An error analysis is carried out which leads to an accuracy of ±2.1 mΩ for samples with 9 mm diameter and an accuracy of ±0.5 mΩ for samples with 20 diameter

Keywords

barium compounds; cavity resonators; electric resistance measurement; high-temperature superconductors; magnesium compounds; microwave measurement; substrates; superconducting thin films; yttrium compounds; 18 GHz; 4.5 mohm; 9 to 20 mm; MgO substrates; YBaCuO thin films; conical cavity; conically shaped cavity; diameter; error analysis; high temperature superconductors; laser ablated film; mode degeneration avoidance; surface resistance measurements; Boundary conditions; Electrical resistance measurement; Equations; High temperature superconductors; Loss measurement; Microwave measurements; Surface resistance; Temperature measurement; Wave functions; Yttrium barium copper oxide;

fLanguage

English

Journal_Title

Microwave Theory and Techniques, IEEE Transactions on

Publisher

ieee

ISSN

0018-9480

Type

jour

DOI

10.1109/22.120094

Filename

120094