Superconductivity of Bi2 (Sr0.9Ca0.1)2 CuO
y
single crystals |
| |
Authors: | X L Wang S X Shang H Wang M H Jiang Z X Zhao |
| |
Institution: | (1) Institute of Crystal Materials, Shandong University, 250100 Jinan, Shandong, People's Republic of China;(2) National Laboratory for Superconductivity, Institute of Physics, Academia Sinica, 100080 Beijing, People's Republic of China |
| |
Abstract: | Bi2 (Sr0.9Ca0.1)2 CuO
y
single crystals were grown by the self-flux method. The temperature dependence of resistance and ac susceptibility measurements showed that the as-grown crystal is semiconductive between 4.2 K and 300 K. However, after annealing in air for more than 20 days the crystal became superconducting with a T
c of 66 K obtained from the R-T curve. The ac susceptibility data also showed a strong superconducting transition at 71 K. X-ray diffraction indicated that the structure of the as-grown and the annealed crystal both are orthorhombic. The T
c of 71 K of the Bi2 (Sr0.9Ca0.1)2 CuO
y
crystal may be due to the increase of oxygen content in the crystal after the long-time annealing in air. It is suggested that the superconductivity of the Ca-doped 2201 phase of the Bi-based system, which up to now was found to have a T
c=7–22 K, is similar to the 2201 phase of the Tl-based system. |
| |
Keywords: | 74 62Bf 74 25– 9 |
本文献已被 SpringerLink 等数据库收录! |
|