Title :
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
fDate :
2/1/1992 12:00:00 AM
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;
Journal_Title :
Microwave Theory and Techniques, IEEE Transactions on
