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Titolo:
Microwave and structural properties of large YBa2Cu3O7-delta films: a study on the homogeneity
Autore:
Lee, SY; Lee, JH; Lim, J; Lee, J; Yun, JH; Moon, SH; Oh, B;
Indirizzi:
Konkuk Univ, Dept Phys, Seoul 143701, South Korea Konkuk Univ Seoul South Korea 143701 ept Phys, Seoul 143701, South Korea LG Elect Inst Technol, Seoul 137724, South Korea LG Elect Inst Technol Seoul South Korea 137724 Seoul 137724, South Korea
Titolo Testata:
SUPERCONDUCTOR SCIENCE & TECHNOLOGY
fascicolo: 11, volume: 14, anno: 2001,
pagine: 921 - 928
SICI:
0953-2048(200111)14:11<921:MASPOL>2.0.ZU;2-I
Fonte:
ISI
Lingua:
ENG
Soggetto:
THIN-FILMS; DEPOSITION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
20
Recensione:
Indirizzi per estratti:
Indirizzo: Lee, SY Konkuk Univ, Dept Phys, Seoul 143701, South Korea Konkuk Univ Seoul South Korea 143701 , Seoul 143701, South Korea
Citazione:
S.Y. Lee et al., "Microwave and structural properties of large YBa2Cu3O7-delta films: a study on the homogeneity", SUPERCOND S, 14(11), 2001, pp. 921-928

Abstract

Large epitaxially grown YBa2Cu3O7-delta (YBCO) films (50 mm in diameter) were prepared on MgO and CeO2-buffered r-cut sapphire (CbS) substrates, for which homogeneity in the microwave surface resistance (R-S) and the crystalstructures were studied. An automated measurement system based on a sapphire-loaded TE01 delta mode cavity resonator was used for investigating the positional dependence of the R-S at low temperatures. The positional dependence of the R-S appeared to be strongly correlated with that of the in-planealignments of YBCO grains in each YBCO film, with low R-S observed at the positions where the full width at half maximum of the Phi -scan of (113) peak appeared small. However, no such correlation was observed between the R-S and the degree of the c-axis orientation of YBCO grains in each YBCO film. With the difference in the c-axis constant as small as similar to0.01 Angstrom over the film area for both YBCO/CbS and YBCO/MgO, the homogeneity inthe R-S still appeared correlated with that of the c-axis constant for YBCO/CbS. For YBCO/MgO, correlation between the R-S and the c-axis constant appeared less clear. Our results show that the in-plane orientation of YBCO grains is one of the most important structural factors to be controlled to reduce the R-S of YBCO films and to improve the homogeneity in the R-S of large c-axis oriented YBCO films.

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Documento generato il 22/09/20 alle ore 23:33:27