Effect of annealing on the superconductivity of Bi2Sr2CaCu2Oy single crystals
Wenbin Wu, Liangbin Wang, Qiaonan Qin, Yitai Qian, Lei Shi, Xiao-Guang Li, Guien Zhou, Yuheng Zhang
DOI 10.1103/PhysRevB.49.1315 · Physical Review B
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Abstract
High-quality as-grown Bi2Sr2CaCu2Oy single crystals with superconducting transition temperatures Tc of 70–83 K have been annealed in air, flowing oxygen, and nitrogen at 400–750 °C. ac susceptibility measurements show that at 450–550 °C Tc is atmosphere and time independently enhanced to 85–86 K and a very narrow diamagnetic transition ΔTc (10–90 % of the complete transition) of 0.5–1 K is obtained, and at 550–750 °C when treated in nitrogen or oxygen Tc increases or decreases and ΔTc broadens with annealing temperature compared with crystals annealed at 450–550 °C. The results are difficult to explain simply by the consideration of oxygen diffusion. Combined with the phase decomposition induced in the annealed crystals, it is suggested that the structural modification may play an important role in the variation of superconductivity of Bi2Sr2CaCu2Oy superconductors.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| Bi2Sr2CaCu2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 86 | Pressure not reported | onset |
| Bi2Sr2CaCu2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 88 | Pressure not reported | onset |
| Bi2Sr2CaCu2Oy Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 96 | Pressure not reported | unknown |
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