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VOLUME 75 (2002) | ISSUE 4 | PAGE 228
Angular dependence of the upper critical field in Bi2Sr2CuO6+δ
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.