<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML"><mml:mrow><mml:mi>Mg</mml:mi><mml:msub><mml:mi>Pd</mml:mi><mml:mn>2</mml:mn></mml:msub><mml:mi>Sb</mml:mi></mml:mrow></mml:math> : A Mg-based Heusler-type superconductor

We report the synthesis and physical properties of a full Heusler compound, $\mathrm{Mg}{\mathrm{Pd}}_{2}\mathrm{Sb}$, which we found to show superconductivity below ${T}_{c}=2.2\phantom{\rule{0.16em}{0ex}}\mathrm{K}$. $\mathrm{Mg}{\mathrm{Pd}}_{2}\mathrm{Sb}$ was obtained by two-step solid-state reaction method its purity cubic crystal structure [$Fm\text{\ensuremath{-}}3m, a=6.4523(1)\phantom{\rule{0.16em}{0ex}}\AA{}$] were confirmed powder x-ray diffraction. Normal superconducting states studied electrical resistivity, magnetic susceptibility, heat capacity measurements. The results that is type-II, weak coupling superconductor (${\ensuremath{\lambda}}_{e\text{\ensuremath{-}}p}=0.53$). observed pressure dependence ${T}_{c}$ ($\mathrm{\ensuremath{\Delta}}{T}_{c}/p\ensuremath{\approx}--0.23\phantom{\rule{0.16em}{0ex}}\mathrm{K}/\mathrm{GPa}$) one strongest reported for compound. electronic structure, phonons, electron-phonon in theoretically investigated. are agreement with experiment, confirming mechanism superconductivity. compare parameters those all Heusler-type superconductors.