Superconducting density of states and vortex lattice of LaRu 2 P 2 observed by scanning tunneling spectroscopy.

We provide the superconducting density of states of the pnictide superconductor LaRu ₂ P ₂ ( T _c = 4.1 K), measured using millikelvin scanning tunneling microscopy. From the tunneling conductance, we extract a density of states which shows the opening of a s-wave single superconducting gap. The temperature dependence of the gap also follows BCS theory. Under magnetic fields, vortices present Caroli de Gennes Matricon states, although these are strongly broadened by defect scattering. From the vortex core size we obtain a superconducting coherence length of ξ  = 50 nm, compatible with the value extracted from macroscopicHc2measurements. We discuss the comparison between s-wave LaRu ₂ P ₂ and pnictide unconventional multiple gap and strongly correlated Fe based superconductors.
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