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New ternary ThCr2Si2-type iron-selenide superconducting materials: synthesis, properties and simulations

By A. L. Ivanovskii

Abstract

Very recently (November, 2010, PRB, 82, 180520R), the first ThCr2Si2-type ternary superconductor K0.8Fe2Se2 with enhanced TC ~ 31 K has been discovered. This finding has stimulated much activity in search for related materials and triggered intense studies of their properties. Indeed, very soon superconductivity (TC ~ 28-32 K) was also found in the series of related ternary systems (so-called 122 phases) such as CsxFe2-ySe2, RbxFe2-ySe2, (TlK)xFeySe2, (TlRb)xFeySe2 etc., which formed a new group of superconducting iron-based materials without toxic As. In this paper the recent progress in synthesis of 122-like iron-selenide systems and in experimental research of their properties is reviewed. Available theoretical data on electronic, magnetic, and elastic properties of this newest group of superconducting materials are also discussed.Comment: 44 pages, 27 figure

Topics: Condensed Matter - Materials Science, Condensed Matter - Superconductivity
Year: 2011
DOI identifier: 10.1016/j.physc.2011.04.009
OAI identifier: oai:arXiv.org:1104.3400
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