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The effective activation energy U-eff(T,B,J) in Hg-1223 single phase superconductors

机译:Hg-1223单相超导体中的有效活化能U-eff(T,B,J)

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We review the methods of calculating the effective activation energy U-eff(T,B,J) for both transport measurements and magnetic decay, together with some theoretical models. Then, we apply these methods to our Hg-1223 single-phase superconductor to obtain the activation energy. Transport results give that the magnetic field and temperature dependence of the U-eff can be well described as U0B-alpha(1-T/T-c)(m). Magnetic relaxation shows that the current density dependence of U(J) can be scaled onto a single curve, which can be considered as the activation energy at some temperature T-0. The pinning mechanism in the measured temperature range does not change, and the activation energy depends separately on the three variables: T, B, and J, are responsible for the magnetic decay data scaling onto a single curve at various temperatures. As temperatures close to zero and near T-c, thermally assisted flux motion model is no longer valid since other processes dominate. (C) 2004 Elsevier Ltd. All rights reserved.
机译:我们回顾了计算传输测量和磁衰变的有效活化能U-eff(T,B,J)的方法,以及一些理论模型。然后,将这些方法应用于我们的Hg-1223单相超导体以获得活化能。传输结果表明,U-eff的磁场和温度依赖性可以很好地描述为U0B-alpha(1-T / T-c)(m)。磁弛豫表明,U(J)的电流密度依赖性可以按比例缩放到一条曲线上,该曲线可以视为在某些温度T-0时的活化能。在测得的温度范围内,钉扎机制不会改变,激活能量分别取决于三个变量:T,B和J,这些变量负责在各种温度下将磁衰变数据缩放到一条曲线上。当温度接近零且接近T-c时,由于其他过程占主导地位,热辅助磁通运动模型不再有效。 (C)2004 Elsevier Ltd.保留所有权利。

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