Yi, Z., Beduz, C., Yang, Y., Scurlock, R.G. and de Groot, P.A.J.
The effect of oxygenation and annealing on the peak effect of the magnetization of melt-grown YBa2CU3O7-?
IEEE Transactions on Applied Superconductivity, 7, (2, Part 2), . (doi:10.1109/77.620883).
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The influence of oxygenation and high temperature annealing on the peak effect of the magnetization of melt-grown YBa2Cu3 O7-? (0<?<1) material has been studied. A control sample was prepared using a normal melt-growth procedure and oxygenated during cooling. A single grain cut from the control sample was annealed in the temperature region of the crystal growth (1030°C-900°C) followed by a standard oxygenation. Some of the control sample was powdered and oxygenated for different lengths of time. The peak of the magnetization shifted to a higher field for the sample oxygenated for longer times. Compared with the control sample, the peak of the magnetization of the sample annealed in the higher temperature region shifted to a lower field. The results are discussed within the framework of the collective pinning and collective creep model.
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