Górnicka Karolina, Gutowska Sylwia, Winiarski Michał J, Wiendlocha Bartlomiej, Xie Weiwei, Cava R J, Klimczuk Tomasz
Faculty of Applied Physics and Mathematics, Gdansk University of Technology, ul. Narutowicza 11/12, 80-233 Gdańsk, Poland.
Advanced Materials Centre, Gdansk University of Technology, ul. Narutowicza 11/12, 80-233 Gdańsk, Poland.
Chem Mater. 2020 Apr 14;32(7):3150-3159. doi: 10.1021/acs.chemmater.0c00179. Epub 2020 Mar 16.
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.
我们展示了LiBi的晶体学分析、超导特性表征和理论建模，LiBi包含最轻和最重的非放射性金属。该化合物结晶为四方（CuAu型）晶体结构，其中Bi方形网被Li平面隔开（参数a = 3.3636(1) Å和c = 4.2459(2) Å，c/a = 1.26）。通过磁化率和热容量测量对超导态进行了详细研究。结果表明，LiBi是一种中等耦合的I型超导体（λ = 0.66），Tc = 2.48 K，热力学临界场H(0) = 157 Oe。理论研究表明，铋方形网是该化合物超导性的原因，但Li平面和Bi平面之间的耦合对超导性有显著贡献。
