Anisotropic superconducting properties of YBa sub 2 Cu sub 3 O sub 7 minus. delta. (. delta. =0. 1 and 0. 4) untwinned single crystals

Journal Article · Mon Nov 27 04:00:00 EST 1989 · Physical Review Letters; (USA)

DOI:https://doi.org/10.1103/PhysRevLett.63.2520· OSTI ID:5147761

Bauhofer, W; Biberacher, W; Gegenheimer, B; Joss, W; Kremer, R K; Mattausch, H; Muller, A; Simon, A ^[1]

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1. Max-Planck-Institut fuer Festkorperforschung, D-7000 Stuttgart 80, Federal Republic of Germany (DE) Max-Planck-Institut fuer Festkorperforschung Grenoble, Boite Postale No. 166X, F-38042 Grenoble CEDEX, France (FR)

We have performed a detailed anisotropy study of the superconducting properties of untwinned single crystals of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}} for {delta}{approx}0.1 and {delta}{approx}0.4 in magnetic fields up to 22 T using a rf method giving critical fields {ital H}{sup *} which are determined by the onset of flux-line motion. For {delta}{approx}0.1 we find the highest {ital H}{sup *} along the {ital b} axis; the {ital a}-{ital b} anisotropy amounts to 20% at 85 K. The 60-K superconductivity for {delta}{approx}0.4 is characterized by the largest {ital H}{sup *} along the {ital a} axis and pronounced 2D behavior as manifested by a cusp in the angular dependence of {ital H}{sup *} and by the extremely steep slope of {ital H}{sup *}(T) perpendicular to {ital c}. We discuss our experimental results with respect to the significance of the Cu-O chains for the high-{ital T}{sub {ital c}} superconductivity of YBa{sub 2}Cu{sub 3}O{sub 7{minus}{delta}}.

• OSTI ID: 5147761
• Journal Information: Physical Review Letters; (USA), Journal Name: Physical Review Letters; (USA) Vol. 63:22; ISSN PRLTA; ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

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& Refractories-- Physical Properties
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