We have performed ultrahigh-resolution photoemission spectroscopy on the intermetallic superconductor hexagonal h-ZrRuP (Tc = 13 K). We observed the opening of a superconducting gap below Tc, and found that the most probable order parameter is s-wave with a gap size (Δ) of 1.8 meV at 6K. This gap size gives 2Δ0/kBT c ∼ 3.5, suggesting the weak-coupling nature of the superconductivity in h-ZrRuP. We also observed a pseudogap-like suppression of spectral weight up to ∼45 meV from the Fermi level, indicative of the strong coupling of electrons with phonons and/or the charge density wave fluctuation.
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