期刊
PHYSICAL REVIEW B
卷 103, 期 21, 页码 -出版社
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevB.103.214501
关键词
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资金
- National Science Centre (Poland) [2017/26/E/ST3/00119]
- US Department of Energy, Division of Basic Energy Sciences [DE-FG02-98ER45706]
We report the synthesis and physical properties of a full Heusler compound, MgPd2Sb, which exhibits superconductivity below Tc = 2.2K. The compound was found to be a type-II, weak coupling superconductor, with a strong pressure dependence of Tc (-0.23K/GPa). Theoretical investigations on electronic structure and electron-phonon coupling confirmed the superconducting mechanism.
We report the synthesis and physical properties of a full Heusler compound, MgPd2Sb, which we found to show superconductivity below T-c = 2.2K. MgPd2Sb was obtained by a two-step solid-state reaction method and its purity and cubic crystal structure [Fm-3m, a = 6.4523(1) angstrom] 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 (lambda(e-p) = 0.53). The observed pressure dependence of T-c (Delta T-c/p approximate to -0.23K/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.
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