Vortex structure and anisotropy of electric resistance in Bi2Sr1.65La0.35CuO6 + δ single crystals

Abstract

The vortex structure of Bi 2 Sr 1.65 La 0.35 CuO 6 + δ single crystals in tilted magnetic fields has been studied by the decoration method. From the observed pattern of vortex chains in the basal plane, the param eter of anisotropy in the superconducting state has been estimated as γ S = 460 ± 40. The electric resistance of Bi 2 Sr 1.65 La 0.35 CuO 6 + δ single crystals has been studied in a broad range of temperatures (T c < T < 300 K) and magnetic fields (up to 16 T). The ratio of resistivities in the direction perpendicular to the basal plane and in plane near the critical temperature T c amounted to ρ ⊥ /ρ || = 3.2 × 10 5 . A possible relationship between the anisotropy in the normal and superconducting states is discussed.