Temperature dependence of the surface resistance and residual losses in YBCO (1 2 4) and melt-textured YBCO (1 2 3) HTSC ceramics at a frequency of 39 GHz

• Published in: Solid state communications 1995-09, Vol.95 (9), p.635-638
• Main Authors: Mikhailova, G.N., Prokhorov, A.M., Seferov, A.S., Troitskii, A.V., Freyhardt, H.C., Krelaus, J., Aleshina, N.M., Nizhelskii, N.A., Polushchenko, O.L.
• Format: Article
• Language: English
• Subjects: A: high-T c superconductors; B: chemical synthesis; C: grain boundaries; D: electronic transport
• ISSN: 0038-1098; 1879-2766
• DOI: 10.1016/0038-1098(95)00272-3

The surface resistance of ceramic Y 1Ba 2Cu 3O 7− x samples obtained by the melting technique and Y 1Ba 2Cu 4O 8 samples were measured within the temperature range 30–120 K. The techniques of manufacturing the samples are described. Measurements were carried out using the resonator method at a frequency of 39 GHz. The residual losses in melt (1 2 3) samples are below 10 −1 Ω which is much smaller than in the traditional ceramics. The residual R s for the best (1 2 4) samples is 0.9 Ω. The results are analyzed in terms of various theoretical models.