Coupling behavior of Cu-O2 layers in oxygen-deficient YBCO films and ultrathin YBCO films

H. C. Yang; H. H. Sung; C. H. Chung; H. E. Horng; C. H. Lin

doi:10.1007/BF00681892

Coupling behavior of Cu-O₂ layers in oxygen-deficient YBCO films and ultrathin YBCO films

H. C. Yang^*, H. H. Sung, C. H. Chung, H. E. Horng, C. H. Lin

^*Corresponding author for this work

Undergraduate Program of Electro-Optical Engineering

Research output: Contribution to journal › Article › peer-review

Abstract

We have measured the resistivity as a function of temperature in a magnetic field at various field angles θ for oxygen-deficient YBCO films and ultrathin YBCO films; θ is the angle between the crystal c axis and the direction of the magnetic field. The angular dependence of the critical field, H_c2, shows a cusplike behaviour at θ=90° for the oxygen-deficient 60 K YBCO films indicating that the Cu-O₂ layers are two-dimensional in nature. Both T_c versus θ in a constant field and H_c2 as a function of θ show a plateau at θ=90° for 83 K (zero resistance) ultrathin YBCO films with a thickness of 20 units of the YBCO cell; these results indicate that there is a coupling between the Cu-O₂ layers. The dimensionality of the Cu-O₂ layers in oxygen-deficient YBCO films and ultrathin YBCO films is discussed in terms of the anisotropic Ginzburg-Landau model and the Tinkham thin-film model.

Original language	English
Pages (from-to)	467-473
Number of pages	7
Journal	Journal of Low Temperature Physics
Volume	90
Issue number	5-6
DOIs	https://doi.org/10.1007/BF00681892
Publication status	Published - 1993 Mar

ASJC Scopus subject areas

Atomic and Molecular Physics, and Optics
General Materials Science
Condensed Matter Physics

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title = "Coupling behavior of Cu-O2 layers in oxygen-deficient YBCO films and ultrathin YBCO films",

abstract = "We have measured the resistivity as a function of temperature in a magnetic field at various field angles θ for oxygen-deficient YBCO films and ultrathin YBCO films; θ is the angle between the crystal c axis and the direction of the magnetic field. The angular dependence of the critical field, Hc2, shows a cusplike behaviour at θ=90° for the oxygen-deficient 60 K YBCO films indicating that the Cu-O2 layers are two-dimensional in nature. Both Tc versus θ in a constant field and Hc2 as a function of θ show a plateau at θ=90° for 83 K (zero resistance) ultrathin YBCO films with a thickness of 20 units of the YBCO cell; these results indicate that there is a coupling between the Cu-O2 layers. The dimensionality of the Cu-O2 layers in oxygen-deficient YBCO films and ultrathin YBCO films is discussed in terms of the anisotropic Ginzburg-Landau model and the Tinkham thin-film model.",

author = "Yang, {H. C.} and Sung, {H. H.} and Chung, {C. H.} and Horng, {H. E.} and Lin, {C. H.}",

year = "1993",

month = mar,

doi = "10.1007/BF00681892",

language = "English",

volume = "90",

pages = "467--473",

journal = "Journal of Low Temperature Physics",

issn = "0022-2291",

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T1 - Coupling behavior of Cu-O2 layers in oxygen-deficient YBCO films and ultrathin YBCO films

AU - Yang, H. C.

AU - Sung, H. H.

AU - Chung, C. H.

AU - Horng, H. E.

AU - Lin, C. H.

PY - 1993/3

Y1 - 1993/3

N2 - We have measured the resistivity as a function of temperature in a magnetic field at various field angles θ for oxygen-deficient YBCO films and ultrathin YBCO films; θ is the angle between the crystal c axis and the direction of the magnetic field. The angular dependence of the critical field, Hc2, shows a cusplike behaviour at θ=90° for the oxygen-deficient 60 K YBCO films indicating that the Cu-O2 layers are two-dimensional in nature. Both Tc versus θ in a constant field and Hc2 as a function of θ show a plateau at θ=90° for 83 K (zero resistance) ultrathin YBCO films with a thickness of 20 units of the YBCO cell; these results indicate that there is a coupling between the Cu-O2 layers. The dimensionality of the Cu-O2 layers in oxygen-deficient YBCO films and ultrathin YBCO films is discussed in terms of the anisotropic Ginzburg-Landau model and the Tinkham thin-film model.

AB - We have measured the resistivity as a function of temperature in a magnetic field at various field angles θ for oxygen-deficient YBCO films and ultrathin YBCO films; θ is the angle between the crystal c axis and the direction of the magnetic field. The angular dependence of the critical field, Hc2, shows a cusplike behaviour at θ=90° for the oxygen-deficient 60 K YBCO films indicating that the Cu-O2 layers are two-dimensional in nature. Both Tc versus θ in a constant field and Hc2 as a function of θ show a plateau at θ=90° for 83 K (zero resistance) ultrathin YBCO films with a thickness of 20 units of the YBCO cell; these results indicate that there is a coupling between the Cu-O2 layers. The dimensionality of the Cu-O2 layers in oxygen-deficient YBCO films and ultrathin YBCO films is discussed in terms of the anisotropic Ginzburg-Landau model and the Tinkham thin-film model.

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JF - Journal of Low Temperature Physics

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ER -

Coupling behavior of Cu-O₂ layers in oxygen-deficient YBCO films and ultrathin YBCO films

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