ISSN:
1432-0630
Keywords:
74.62Bf
;
74.25−9
Source:
Springer Online Journal Archives 1860-2000
Topics:
Mechanical Engineering, Materials Science, Production Engineering, Mining and Metallurgy, Traffic Engineering, Precision Mechanics
,
Physics
Notes:
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.
Type of Medium:
Electronic Resource
URL:
http://dx.doi.org/10.1007/BF00331520
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