The Search and Theoretical Guidance for Higher Tc Superconducting Materials
Abstract
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, and/or 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 Ba(Bi1-xPbx)O3 (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.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 25, 2019
- Accession Number
- AD1096603
Entities
People
- Ian Fisher
- Malcolm Beasley