The Preparation Of YBCO Superconducting And The Exploration Of Energy Gap

This article explores the preparation of YBCO through sol-gel method, and improve suspension performance of YBCO. Sol-gel preparation and relational theory experiment with the various factors affecting the performance of superconducting suspension by analyzing the sintering temperature, oxygen atmosphere, the doping concentration. Moreover, we study the high temperature copper oxid e superconducting gap and pseudogap relations, to further explore the performance analysis of doping on YBCO. The origin of the pseudogap and superconducting energy gap relationship has yet to be resolved clearly, we reviewed Progress superconducting energy gap problem from the experimental and theoretical aspects. Combing the results of various observational instruments, as well asseveral related theoretical model, we have a simple discussion for these results and also have expectations for further understanding of the superconducting energy gap and pseudogap whi ch pl a y pos itive rol es. C opper oxide hi gh-t emperature superconductivity has a rich physical properties, which also makes the BCS theory facing unprecedented challenges. Explore a range of results and theoretical analysis of the electron and hole carriers experiments showed, “electro-acoustic coupling” failure in the copper oxide superconductivity. In exploring YBCO suspension performance, found the effect of the oxygen content of the superconducting lattice structure is very important, oxygen content plays a decisive role in the superconductivity of YBCO superconductor. We know that high-temperature superconductors are doped superconductors, by calculating high-temperature superconductor energy gap of YBCO when the oxygen content, revealing effect of the doping on superconductivity. Because of the similarity of structure about iron-based superconductors and copper oxide superconductor, we can continue to explore the impact of doping on iron-based superconductors to provide more important information about copper oxide superconducting mechanism.Contents of this paper is divided into six chapters:The first chapter describes the whole history and the development of superconductivity and superconducting materials in the current application of the social situation and outlook. It describes that Onnes found the first superconductivity at 1911, to the current 100-year period, the course of the superconducting transition temperature, as well as high-temperature copper oxide superconducting material properties. It also describes the increase process of the iron-based superconducting transition temperature. Finally, making a brief overview of the sol- gel method of application.The second chapter describes the basic principles of the sol- gel method, and outlines the advantages and disadvantages of this approach, and outlines the preparation of YBCO superconducting block, and analyzes the process of the sol-gel preparing YBCO, and various factors of impacts.The third chapter is the experimental part. It describes the preparation and analysis process YBCO bulks, including laboratory equipment, laboratory materials, as well as several experimental programs and their processes. And the experimental results were collated and analyzed, we also propose the improvements, and measure the levitation force of the calcined sample in the use of the experimental results, and conducte a highly analytical. Finally, the XRD analysis of the samples are summarized and the suspension and superconductivity theory is leaded.The fourth chapter describes the content of the performance impact of doping on YBCO. Firstly, summarizing the doping replacement impacts on YBCO performance. They are the doping of improving the performance of YBCO, the doping of effecting thermodynamic behavior and the doping of improving the mechanical properties.The fifth chapter describes the content of the superconducting energy gap of iron-based high temperature superconducting. Firstly, describes the similarities of structures and dissimilarity of iron-based superconducting and cuprate superconducting, and leading the exploring of the relations of high-temperature superconductor energy gap and pseudogap which existence in high-temperature superconductor. describing the relationship between these two energy gaps by angle-resolved photoelectron spectroscopy experiments specifically. Then describing the impacts of electron-phonon interaction on track fluctuations in iron-based superconductors from the microscopic theory, and summarizes the influence of the doping to iron-based superconducting energy gap. Making the description of chemical doping aspects, namely the case of doping in Fe-bit and the doping outside the layer of Fe As and discirbing the effects of F-doped to it.Chapter VI of the contents summarize this paper. Analyzing the preparation step and experimental raw material of sol-gel method which is used to prepare YBCO and make a summarizing. We must consider the impact of oxygen atmosphere when making better YBCO superconducting blocks. Then summarizing the similarity of high temperature superconducting cuprate and iron-based superconducting and proposing that the impact of doping on the iron-based superconducting will provide important information for cuprate superconductivity microscopic mechanism. In order to exploring the physical mechanism thoroughly of iron-based high-temperature superconductivity, we need to find a new class of iron-based superconductors, which require high-temperature superconducting transition temperature, stable in air, properties which are suitable for measuring physical. Finally, making a prospecting of superconducting copper oxide and iron-based superconducting.