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Titolo:
UNUSUAL CRYSTAL-STRUCTURE OF NONSUPERCONDUCTING Y1BA2CU3O7-X FILMS ONBUFFERED SILICON SUBSTRATES
Autore:
LINZEN S; KRAUSSLICH J; KOHLER A; SEIDEL P; FREITAG B; MADER W;
Indirizzi:
UNIV JENA,INST FESTKORPERPHYS,MAX WIEN PL 1 D-07743 JENA GERMANY UNIV JENA,INST FESTKORPERPHYS D-07743 JENA GERMANY UNIV JENA,INST OPT & QUANTENELEKT D-07743 JENA GERMANY UNIV BONN,INST ANORGAN CHEM D-53117 BONN GERMANY
Titolo Testata:
Physica. C, Superconductivity
fascicolo: 3-4, volume: 290, anno: 1997,
pagine: 323 - 333
SICI:
0921-4534(1997)290:3-4<323:UCONYF>2.0.ZU;2-L
Fonte:
ISI
Lingua:
ENG
Soggetto:
EDGE JOSEPHSON-JUNCTIONS; THIN-FILMS; DC-SQUIDS; DISORDER; SYSTEM; LAYERS;
Keywords:
STRUCTURE OF THIN FILMS; HREM; YBCO; OXYGEN STOICHIOMETRY;
Tipo documento:
Article
Natura:
Periodico
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
S. Linzen et al., "UNUSUAL CRYSTAL-STRUCTURE OF NONSUPERCONDUCTING Y1BA2CU3O7-X FILMS ONBUFFERED SILICON SUBSTRATES", Physica. C, Superconductivity, 290(3-4), 1997, pp. 323-333

Abstract

Superconducting common c-axis oriented YBCO films as well as non-superconducting films epitaxially grown at significantly reduced substratetemperatures were deposited by laser ablation on CeO2/YSZ buffered silicon substrates. The crystal structure of the non-superconducting films measured by XRD is collapsed from the original orthorhombic one, whereas the chemical composition detected using RES and EDX remains identical, Especially the oxygen content in the non-superconducting material is as high as in the common 90 K superconductor. Thus, the change in the electrical behaviour is only due to a structural modification. The crystallographic model of a simple cubic YBCO perovskite unit cell does not represent completely our experimental results measured on thenon-superconducting YBCO. A modified model based on detailed TEM and XRD measurements and known crystal defects of orthorhombic YBCO is proposed. (C) 1997 Elsevier Science B.V.

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Documento generato il 30/09/20 alle ore 08:54:03