Superconductivity on a Bi Square Net in LiBi.

Chem Mater

Faculty of Applied Physics and Mathematics, Gdansk University of Technology, ul. Narutowicza 11/12, 80-233 Gdańsk, Poland.

Published: April 2020

We present the crystallographic analysis, superconducting characterization and theoretical modeling of LiBi, that contains the lightest and the heaviest nonradioactive metal. The compound crystallizes in a tetragonal (CuAu-type) crystal structure with Bi square nets separated by Li planes (parameters = 3.3636(1) Å and = 4.2459(2) Å, c/a = 1.26). Superconducting state was studied in detail by magnetic susceptibility and heat capacity measurements. The results reveal that LiBi is a moderately coupled type-I superconductor (λ = 0.66) with = 2.48 K and a thermodynamic critical field H(0) = 157 Oe. Theoretical studies show that bismuth square net is responsible for superconductivity in this compound, but the coupling between the Li planes and Bi planes makes a significant contribution to the superconductivity.

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http://www.ncbi.nlm.nih.gov/pmc/articles/PMC7588065PMC
http://dx.doi.org/10.1021/acs.chemmater.0c00179DOI Listing

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