23aA4 タリウム系銅酸化物超伝導体の良質単結晶育成(バルク成長III)

抄録

High quality single crystals of Tl-based cuprate superconductors arc of profound importance to clarifying intrinsic physical properties of the high-T_c cuprates. We have succeeded to grow single crystals of the Tl-2201 superconductor with extremely high quality using a self-flux method. The maximum value of resistivity ratio R (RT)/R(T_c) of the as-grown crystals is 18.3. It is found that a closed atmosphere method using a gold crucible is useful to grow the high quality single crystals.