Anisotropy of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi>H</mml:mi></mml:mrow><mml:mrow><mml:mi>c</mml:mi><mml:mn>2</mml:mn><mml:mn/></mml:mrow></mml:msub></mml:mrow></mml:math>and the breadth of the resistive transition of polycrystalline<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi mathvariant="normal">Y</mml:mi><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Ba</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Cu</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn><mml:mo>−</mml:mo><mml:mi>x</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>in a magnetic field
D.O. WelchMaterials Science Division, Brookhaven National Laboratory, Upton, New York 11973M. SuenagaMaterials Science Division, Brookhaven National Laboratory, Upton, New York 11973T. AsanoMaterials Science Division, Brookhaven National Laboratory, Upton, New York 11973
1987lv
ABI
Аннотация
Measurements of the resistive transition in a magnetic field of a polycrystalline sample of the high-${T}_{c}$ superconducting oxide $\mathrm{Y}{\mathrm{Ba}}_{2}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}x}$ were used, together with a theoretical analysis based on the anisotropic Ginzburg-Landau theory of the upper critical field ${H}_{c2}$ and the Davidson-Tinkham equation for the resistivity of a heterogeneous aggregate of superconducting and normal crystallites, to obtain values of ${H}_{c2}$, in the temperature range 83-93 K, for fields parallel and perpendicular to the copper-oxygen layers. The anisotropy ratio for ${H}_{c2}$ is found to be in the range of 25-50.
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