Single-phase 60-K bulk superconductor in annealed<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><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:mi mathvariant="normal">Y</mml:mi><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:mn>0</mml:mn></mml:mrow><mml:mrow><mml:mn>7</mml:mn><mml:mo>−</mml:mo><mml:mi>δ</mml:mi></mml:mrow></mml:msub></mml:mrow><mml:mo>(</mml:mo><mml:mn>0.3</mml:mn><mml:mo><</mml:mo><mml:mi>δ</mml:mi><mml:mo><</mml:mo><mml:mn>0.4</mml:mn><mml:mo>)</mml:mo></mml:math>with correlated oxygen vacancies in the Cu-O chains
R. J. Cava(AT&T (United States)), B. Batlogg(AT&T (United States)), C. H. Chen(AT&T (United States)), Edward A. Rietman(AT&T (United States)), S. M. Zahurak(AT&T (United States)), D. J. Werder(AT&T (United States))
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Abstract
Employing a gettered annealing technique, we have prepared homogeneous polycrystalline samples of oxygen-deficient ${\mathrm{Ba}}_{2}\mathrm{Y}{\mathrm{Cu}}_{3}{\mathrm{O}}_{7\ensuremath{-}\ensuremath{\delta}}$ for $0\ensuremath{\le}\ensuremath{\delta}\ensuremath{\le}0.7$. Measurements of resistive ${T}_{c}$, resistivity, magnetization, and lattice parameter indicate that a distinct bulk superconducting phase with a ${T}_{c}$ of 60 K occurs in the range of $0.3<\ensuremath{\delta}<0.4$. This phase displays partial ordering of oxygen vacancies in the Cu-O chains as found by electron diffraction studies.
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