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The large single crystals of SrSnP were prepared using Sn self-flux method.The superconductivity in the tetragonal SrSnP is observed with the criticaltemperature of ~2.3 K. The results of a crystallographic analysis,superconducting characterization, and theoretical assessment of tetragonalSrSnP are presented. The SrSnP crystallizes in the CaGaN structure type withspace group P4/nmm (S.G.129, Pearson symbol tP6) according to the singlecrystal X-ray diffraction characterization. A combination of magneticsusceptibility, resistivity, and heat capacity measurements confirms the bulksuperconductivity with Tc = 2.3(1) K in SrSnP. According to the X-rayphotoelectron spectroscopy (XPS) measurement, the assignments of Sr2+ and P3-are consistent with the chemical valence electron balance principles. Moreover,it is highly likely that Sn atom has only one unusual oxidation state.First-principles calculations indicate the bands around Fermi level arehybridized among Sr-d, Sn-p, and P-p orbitals. The strong Sn-P and Sr-Pinteractions pose as keys to stabilize the crystallographic structure andinduce the superconductivity, respectively. The physics-based electronic andphononic calculations are consistent with the molecular viewpoint. Afterincluding the spin-orbit coupling (SOC) into the calculation, the banddegeneracies at gamma-point in the first Brillouin zone (BZ) split into twobands, which yield to the van Hove singularities around Fermi level.

Novel Superconducting SrSnP with Strong Sn-P Antibonding Interaction: Is the Sn Atom Single or Mixed Valent?