الفهرس 
acknowledgmentOnly 14 pages are availabe for public view
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Abstract
physical properties of the high temperature superconductors htsc have been of considerable interest over the last decade from both experimental and theoretical points of view the resistivity measurements of these systems reovide some information regarding the type of transition since the discovery of superconductivity by kamerlingh onnes in 1911(1) in hg at 4 k one of the primary objectives of superconductivity research has been to raise the transition temperature t at which the resistivity goes to zero value it was found that half of the metallic elements and number of alloys exhibit superconductivity when they are sufficiently cooled shows some of the uperconducting elements and copmpounds and their transition temperatures.