Single crystal study of Tl 2Ba 2CuO 6+δ

Abstract

Tl 2Ba 2CuO 6+δ single crystals were synthesized using a KCl flux method. The T c value was controlled from 0 K (nonsuperconducting normal metal) to 75 K by annealing in oxygen or argon atmospher. The results of in-plane resistivity (ρ ab ) and Hall coefficient were very similar to those for ceramic samples. Anisotropy of resistivity ρ c/ρ ab measured by the Montgomery method was as large as 6×10 2 at room temperature even for a normal metallic sample. The temperature dependence of ρ c was metallic for all T c 's.