We report the synthesis and characterization of a new compound Mg4Pd7As6, which was found to be a superconductor with Tc=5.45~K. Powder X-ray diffraction confirms the U4Re7Si6 structure (space group Im-3m, no. 229) with the lattice parameter a = 8.2572(1)~\AA. Magnetization, specific heat, and electrical resistivity measurements indicate that it is a moderate-coupling (λ=0.72) type-II superconductor. The electronic and phonon structures are calculated, highlighting the importance of antibonding Pd-As interactions in determining the properties of this material. The calculated electron-phonon copling parameter λ=0.76 agrees very well with the experimental finding, which confirms the conventional pairing mechanism in Mg4Pd7As6.
@article{arxiv.2408.06813,
title = {Superconductivity in ternary Mg$_4$Pd$_7$As$_6$},
author = {Hanna Świątek and Sylwia Gutowska and Michał J. Winiarski and Bartlomiej Wiendlocha and Tomasz Klimczuk},
journal= {arXiv preprint arXiv:2408.06813},
year = {2024}
}