On a new Y-based noncentrosymmetric superconducting cage compound

July 25, 2020

Our paper on a new Y-based noncentrosymmetric superconducting cage compound is published in Dalton Transactions.

The new ternary compound Y4Be33Pt16 was prepared from elements by arc melting, and its crystal structure was determined from single-crystal X-ray diffraction data (space group I4¯3d, a = 13.4849(3) Å). The material is the first representative of a new structure type of complex intermetallic compounds and reveals a cage-like crystal structure. Analysis of chemical bonding by means of the electron localizabilty approach indicates ionic interaction of yttrium with the rest of the crystal structure, characteristic for cage compounds, in particular for clathrates. In contrast to the mostly two-centre bonding in the framework of clathrates, the new compound is characterized by a multi-centre interaction within the framework, caused by the demand of the valence electrons in the system. The non-centrosymmetric material enters the superconducting state at TC = 0.9 K.

Alfred Amon, Eteri Svanidze, Yurii Prots, Michael Nicklas, Ulrich Burkhardt, Alim Ormeci, Andreas Leithe-Jasper, and Yuri Grin, "Y4Be33Pt16 - a non-centrosymmetric cage superconductor with multi-centre bonding in the framework," Dalton Transactions 49 (27), 9362-9368 (2020).

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