Abstract
Floating zone experiments were carried out in the Bi-Sr-Ca-Cu-O system, at and near the stoichiometric composition 2 2/1/2 . Aligned structures made of elongated plates with their c-axis perpendicular to the growth direction were obtained at slow growth rates (1 mm.h −1). The superconducting properties of the samples were examined by electrical and magnetic measurements. Critical current densities J c were measured at 77 K and also estimated from hysteresis cycles at 4.2 K using the Bean's model, yielding values of 3.10 3 and 6.10 5 A.cm −2 respectively. The samples also exhibited a strong magnetic and electrical anisotropy.
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