MgPd2Sb – the first Mg-based Heusler-type superconductor

作     者：Winiarski, Michal J. Kuderowicz, Gabriel Górnicka, Karolina Litzbarski, Leszek S. Stolecka, Kamila Wiendlocha, Bartlomiej Cava, Robert J. Klimczuk, Tomasz 

作者机构：Faculty of Applied Physics and Mathematics Gdansk University of Technology Narutowicza 11/12 Gdansk80-233 Poland Advanced Materials Centre Gdansk University of Technology ul. Narutowicza 11/12 Gdańsk80-233 Poland Faculty of Physics and Applied Computer Science AGH University of Science and Technology Aleja Mickiewicza 30 Krakow30-059 Poland Department of Chemistry Princeton University PrincetonNJ08544 United States 

出 版 物：《arXiv》 (arXiv)

年 卷 期：2021年

核心收录：

主　　题：Electronic structure 

摘      要：We report the synthesis and physical properties of a new full Heusler compound, MgPd2Sb, which we found to show superconductivity below Tc = 2.2 K. MgPd2Sb was obtained by a two-step solid state reaction method and its purity and cubic crystal structure (F m-3m, a = 6.4523(1) Å) were confirmed by powder x-ray diffraction. Normal and superconducting states were studied by electrical resistivity, magnetic susceptibility and heat capacity measurements. The results show that MgPd2Sb is a type-II, weak coupling superconductor (λep = 0.56). The observed pressure dependence of Tc (ΔTc/p ≈ -0.23 K/GPa) is one of the strongest reported for a superconducting Heusler compound. The electronic structure, phonons and electron-phonon coupling in MgPd2Sb were theoretically investigated. The obtained results are in agreement with the experiment, confirming the electron-phonon coupling mechanism of superconductivity. We compare the superconducting parameters to those of all reported Heusler-type superconductors. Copyright © 2021, The Authors. All rights reserved.