AN EFFICIENT AND REPRODUCIBLE APPROACH FOR ATTAINING SUPERCONDUCTIVITY AT 128-K IN TL2BA2CA2CU3O10-DELTA

Journal article

We report an efficient, and highly reproducible, method for the preparation of almost single phase Tl-2223 material, which is characterized by high-temperature superconductivity with Tcmidpoint = 128 K and Tczero = 126 K as measured by electrical resistivity, and a diamagnetic onset temperature [Tcmag] of 128 K as measured by AC susceptibility. This procedure involves synthesizing a material with nominal stoichiometry Tl1.6Ba2Ca2.4Cu3O10-δ, which was sintered at 910°C for 3 h, annealed at 750°C (10 days) in an evacuated quartz tube, and finally annealed at 600°C (2 h) in a 0.2% oxygen/nitrogen gas mixture. Based on these results, it appears that the optimization of the hole concentration in Tl-2223, achieved here by controlling the oxidizing/reducing power of the annealing atmosphere, appears to be crucially important in attaining such a high transition temperature.

Authors: Liu, R; Tallon, J; Edwards, P

• Publication status: Published
• Journal: PHYSICA C
• Volume: 182
• Issue: 1-3
• Pages: 119-122
• Publication date: 1991-10-20
• DOI: 10.1016/0921-4534(91)90466-C
• ISSN: 0921-4534
• Language: English