paper

Superconductivity induced by Mg deficiency in non-centrosymmetric phosphide MgRhP

arXiv:1910.06523 · doi:10.1103/PhysRevMaterials.3.124802

Abstract

The search for non-centrosymmetric superconductors that may exhibit unusual physical properties and unconventional superconductivity has yielded the synthesis of a non-centrosymmetric phosphide MgRhP with an AlMoC-type structure. Although stoichiometric MgRhP does not exhibit superconductivity at temperatures above 2 K, we found that an Mg deficiency of approximately 5 at.% in the MgRhP induced superconductivity at 3.9 K. Physical properties such as the lattice parameter a = 0.70881 nm, Sommerfeld constant = 5.36 mJ mol K, specific heat jump C/Tc = 0.72, electron-phonon coupling constant = 0.58, upper critical field H(0) = 24.3 kOe, and pressure effect dTc/dP = -0.34 K/GPa were measured for the superconducting MgRhP ( 0.1). Band-structure calculations indicate that exotic fermions, which are not present in high-energy physics, exist in MgRhP. Since Mg, Rh, and P are the first elements used at each crystal site of AlMoC-type compounds, the discovery of MgRhP may guide the search for new related materials.

12 pages, 9 figures. arXiv admin note: text overlap with arXiv:1603.03093 by other authors

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