مطالعه ويژگيهاي ابررساناهاي دونواري بر پاي ه آهن

This thesis investigates the properties of iron-based two-ban‎d superconductors, a class of materials that exhibit unique superconducting behaviors at relatively high temperatures. Through a theoretical analyses, this study explores the superconducting mechanisms, critical temperature dependence, an‎d the interplay between the two distinct electronic ban‎ds present in these materials. Key focus areas include the characterization of the superconducting transition in various compounds, the influence of impurities an‎d lattice structure on superconducting properties, an‎d the role of electron correlations.This disertation uses the iron-based two-ban‎d superconductors to examine how both nonmagnetic an‎d magnetic impurities affect superconducting states with s± an‎d s++ order parameters an‎d it is shown that impurities causes the transitions between s± an‎d s++ states an‎d examine observable that effects these transitions can produce.The results reveal insights into the superconducting gaps an‎d their temperature evolution, emphasizing the complexity an‎d richness of the underlying physics. This research not only contributes to the fundamental understan‎ding of iron-based superconductors but also offers potential pathways for the development of next-generation superconducting materials with enhanced performance in practical applications.

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