Magnetic measurements of the upper critical field of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">YBa</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><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:math><mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">O</mml:mi></mml:mrow><mml:mrow><mml:mn>7</mml:mn><mml:mi mathvariant="normal">−</mml:mi><mml:mi mathvariant="normal">δ</mml:mi></mml:mrow></mml:msub></mml:mrow></mml:math>single crystals
U. WelpMaterials Science Division, Argonne National Laboratory, Argonne, Illinois 60439W. K. KwokMaterials Science Division, Argonne National Laboratory, Argonne, Illinois 60439G. W. CrabtreeMaterials Science Division, Argonne National Laboratory, Argonne, Illinois 60439K. G. VandervoortMaterials Science Division, Argonne National Laboratory, Argonne, Illinois 60439J. Z. LiuMaterials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
1989lv
ABI
Annotatsiya
dc magnetization measurements in fields up to 5 T on single crystals of ${\mathrm{YBa}}_{2}$${\mathrm{Cu}}_{3}$${\mathrm{O}}_{7\mathrm{\ensuremath{-}}\mathrm{\ensuremath{\delta}}}$ reveal a well defined onset of diamagnetism allowing a unique magnetic determination of the upper critical field and its anisotropy. The upper-critical-field slopes are -1.9 and -10.5 T/K corresponding to coherence lengths of 16 and 3 A\r{} for fields perpendicular and parallel to the CuO planes. At the magnetically determined nucleation temperatures no distinct features are found in resistive transition curves.
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