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The Search and Theoretical Guidance for Higher Tc Superconducting Materials

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Technical Report,15 Sep 2014,14 Sep 2019

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Board of Trustees of the Leland Stanford Junior University Stanford United States

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The overarching goal of the research was to identify mechanisms for high temperature s-wave superconductivity based on a combination of theory and experimental measurements of paradigmatic materials, and then to perform targeted searches for materials exhibiting these effects based on theoretical insights. Our work primarily focused on the inter-relation of specific types of charge ordered states and superconductivity, but we also took the opportunity to explore a variety of other promising directions based on opportunities that arose. Principle research directions included 1 the possibility of enhanced pairing interactions associated with materials that support a charge disproportionated charge density wave CD-CDW in part of their phase diagram, asdistinct from CDWs arising from Fermi surface nesting, andor that comprise valence skipping elements 2 the relation between superconductivity, charge density wave correlations, and disorder and 3 the search for and growth of higher Tc superconducting materials using molecular-beam epitaxy.Material systems that were studied included BaBiO3 BBO and the related solid solutions Ba1-xKxBiO3 BKBO and BaBi1-xPbxO3 BPBO analogs of BBO including CsTlCl3, CsTlFl3 and Cs1.17In0.81Cl3 Tl-doped PbTe Pd-intercalated RTe3 R rare earth Sr1xLaxCuO2 La2-xBaxCuO4 Ca2RuO4 WO3 and Cu-intercalated TiSe2. This work resulted in 24 articles published in peer reviewed journals.

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