Abstract
Single crystals of Bi 2 Sr 2 CuO 6+δ were synthesized and characterized by X-ray diffraction. The Bi(2201) sample remains not superconducting or magnetically ordered down to 5 K. With an applied magnetic field perpendicular or parallel to the c-axis, Magnetic measurements yielded anisotropic magnetic susceptibilities κ{script} c (H⊥c) and κ{script} ab (H{norm of matrix}c). Both can be fitted to the sum of a temperature-independent κ{script} 0 and a Curie-Weiss term C/(T+θ p ) in the temperature range between 5 and 300 K, with a common Curie constant C = 1.0 × 10 -2 cm 3 K/mol and Curie-Weiss paramagnetic intercept θ p =+1.1 K. Since the resulting Curie-Weiss term is the same for both directions, the overall anisotropy Δκ{script}≡κ{script} c -κ{script} ab =Δκ{script} 0 is also temperature independent. Its magnitude, 3.3×10 -5 cm 3 /mol, however, is lower than the corresponding values for Bi(2212) (2.3×10 -4 cm 3 /mol) and Bi(2223) (5.8×10 -4 cm 3 /mol). © 1992.