Abdelhadi, Maher Mahmoud Hussein (1993) Critical currents and pinning forces in Y₁Ba₂Cu₃O₇₋₈Hi-T( c ) superconductor. Masters thesis, King Fahd University of Petroleum and Minerals.
Current-Voltage measurements in the presence of a small magnetic field have been preformed on high quality samples of Y₁₂₃ and Y₁₂₃(Ag₂O)[x] Hi-T[c] superconductors, to study the behaviour of the critical currents, pinning forces and flux flow resistance (FFR) near T[c]. The addition of Ag₂O enhances the critical currents and reduces the flux flow resistance in all flux flow regions. Moreover FFR exhibits a broad minimum at low temperatures, then diverges near T[c]. This minimum becomes sharper in the field cooled states of Y₁₂₃, and occurs at fields near B[c]. The field cooled pinning forces follow a scaling behaviour (near T[c]) as a function of the reduced field B/B[c₂]. Furthermore, Viscosity coefficient n, deduced from the FFR and Kim's model, displays sharp peaks for different Ag₂O concentrations x, with sharper peaks for higher x. Viscosity coefficient n versus temperature exhibits broad maximum at low temperatures and decreases rapidly close to T[c].
|Item Type:||Thesis (Masters)|
|Divisions:||College Of Sciences > Physics Dept|
|Creators:||Abdelhadi, Maher Mahmoud Hussein|
|Committee Advisor:||Zig, Khalil A.|
|Committee Members:||Dabbousi, O. B. and Bahlouli, H and Hallak, A. B. and Khattak, Guldad K.|
|Deposited By:||KFUPM ePrints Admin|
|Deposited On:||22 Jun 2008 16:42|
|Last Modified:||25 Apr 2011 08:54|
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