Critical currents and pinning forces in yttrium(1) barium(2) copper(3) oxygen(7-delta) high critical...

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" Critical currents and pinning forces in yttrium(1) barium(2) copper(3) oxygen(7-delta) high critical transition temperature superconductor "
M. M. H. Abdelhadi

Document Type	:	Latin Dissertation
Language of Document	:	English
Record Number	:	1112819
Doc. No	:	TLpq230738823
Main Entry	:	M. M. H. Abdelhadi
Title & Author	:	Critical currents and pinning forces in yttrium(1) barium(2) copper(3) oxygen(7-delta) high critical transition temperature superconductor\ M. M. H. Abdelhadi
College	:	King Fahd University of Petroleum and Minerals (Saudi Arabia)
Date	:	1993
student score	:	1993
Degree	:	M.S.
Page No	:	141
Abstract	:	Current-Voltage measurements in the presence of a small magnetic field have been preformed on high quality samples of usdY\sb{123}usd and usdY\sb{123}/(Ag\sb2O)\sb{x}usd Hi-usdT\sb{c}usd superconductors, to study the behaviour of the critical currents, pinning forces and flux flow resistance (FFR) near usdT\sb{c}usd. The addition of usdAg\sb2Ousd 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 usdT\sb{c}usd. This minimum becomes sharper in the field cooled states of usdY\sb{123}usd, and occurs at fields near usdB\sb{c}usd. The field cooled pinning forces follow a scaling behaviour (near usdT\sb{c}usd) as a function of the reduced field usdB/B\sb{c2}.usd Furthermore, Viscosity coefficient usd\etausd, deduced from the FFR and Kim's model, displays sharp peaks for different usdAg\sb2Ousd concentrations x, with sharper peaks for higher x. Viscosity coefficient usd\etausd versus temperature exhibits broad maximum at low temperatures and decreases rapidly close to usdT\sb{c}usd.
Subject	:	Condensation
	:	Pure sciences