Microwave properties of YBCO thin films in the weakly coupled grain model

Microwave properties of YBCO thin films in the weakly coupled grain model

Microwave properties of highly oriented thin YBCO films deposited on YSZ and LaAlO sub(3) substrates were investigated at 3 GHz and 4.3 GHz using microstrip resonator technique. The microwave characteristics of the films on YSZ substrates were close to those of a medium containing weak links and wer...

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Veröffentlicht in:Journal of low temperature physics 1997, Vol.106 (3-4), p.475-480
Hauptverfasser: Nurgaliev, T, Chakalov, R A, Ivanov, Z, Donchev, T, Spasov, A
Format: Artikel
Sprache:eng
Schlagworte:
Approximation theory
Characterization
Film preparation
Magnetic properties
Mathematical models
Microwaves
Q factor measurement
Superconducting films
Thin films
Yttrium compounds
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Zusammenfassung:Microwave properties of highly oriented thin YBCO films deposited on YSZ and LaAlO sub(3) substrates were investigated at 3 GHz and 4.3 GHz using microstrip resonator technique. The microwave characteristics of the films on YSZ substrates were close to those of a medium containing weak links and were interpreted in the coupled grain model approximation. The YBCO films on LaAlO sub(3) substrates demonstrated very good microwave properties and could be considered at least as samples with 'strong' weak links. Unloaded Q-factor of microstrip resonators prepared from such films and Cu ground plane reached 3000 at 77 K.
ISSN:0022-2291
1573-7357
DOI:10.1007/BF02399655