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VOLUME 75 | ISSUE 4 | PAGE 228
Angular dependence of the upper critical field in \boldsymbol{\rm Bi_2Sr_2CuO_{6+\delta }}
S. I. Vedeneev+*, Yu. N. Ovchinnikov^{\square\triangle}
+P. N. Lebedev Physical Institute RAS, 117924 Moscow, Russia
*Grenoble High Magnetic Field Laboratory, Max-Planck-Institut für Festkörperforschung and Centre National de la Recherche Scientifique, F-38042 Grenoble, France
^\squareL. D. Landau Institute for Theoretical Physics RAS, 117940 Moscow, Russia
^\triangleCentre de Recherches sur les Très Basses Températures, Centre National de la Recherche Scientifique, F-38042 Grenoble, France


PACS: 74.25.Ha, 74.60.Ec, 74.72.Hs
Abstract
The angular dependence of the upper critical magnetic field has been investigated in a wide range of temperatures in very high-quality Bi2Sr 2CuO6+δ single crystals with critical temperature Tc (midpoint) \simeq9 K in magnetic fields up to 28 T. Although the typical value of the normal state resistivity ratio \rho _{c}/\rho _{ab}\approx 10^{4}, the anisotropy ratio H_{c2\parallel ab} / H_{c2\perp
ab} of the upper critical fields is much smaller and shows an unexpected temperature dependence. A model is proposed based on a strong anisotropy and a small transparency between superconducting layers.


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