Publications Repository - Gdańsk University of Technology

We report the synthesis and physical properties of a full Heusler compound, MgPd2Sb, which we found toshow superconductivity belowTc=2.2K. MgPd2Sb was obtained by a two-step solid-state reaction methodand its purity and cubic crystal structure [Fm-3m,a=6.4523(1) Å] were confirmed by powder x-ray diffrac-tion. Normal and superconducting states were studied by electrical resistivity, magnetic susceptibility, andheat capacity measurements. The results show that MgPd2Sb is a type-II, weak coupling superconductor(λe-p=0.53). The observed pressure dependence ofTc(Tc/p≈–0.23 K/GPa) is one of the strongest reportedfor a superconducting Heusler compound. The electronic structure, phonons, and electron-phonon coupling inMgPd2Sb were theoretically investigated. The obtained results are in agreement with the experiment, confirmingthe electron-phonon coupling mechanism of superconductivity. We compare the superconducting parameters tothose of all reported Heusler-type superconductors.

Authors

• dr inż. Michał Winiarski link open in new tab ,
• Gabriel Kuderowicz,
• dr inż. Karolina Górnicka link open in new tab ,
• dr inż. Leszek Litzbarski link open in new tab ,
• Kamila Stolecka link open in new tab ,
• Bartlomiej Wiendlocha,
• R.j. Cava,
• prof. dr hab. inż. Tomasz Klimczuk link open in new tab