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We have performed transverse- and zero-field muon spin rotation/relaxationexperiments, as well as magnetometry measurements, on samples of Fe1-xVxSe andtheir Li+NH3 intercalates Li0.6(NH2)0.2(NH3)0.8 Fe1-x Vx Se. We examine the lowvanadium substitution regime: x = 0.005, 0.01, and 0.02. The intercalationreaction significantly increases the critical temperature (Tc) and thesuperfluid stiffness for all x. The nonintercalated samples all exhibit Tc =8.5 K while the intercalated samples all show an enhanced Tc > 40 K. Vanadiumsubstitution has a negligible effect on Tc, but seems to suppress thesuperfluid stiffness for the nonintercalated samples and weakly enhance it forthe intercalated materials. The optimal substitution level for the intercalatedsamples is found to be x = 0.01, with Tc = 41 K and {\lambda}_{ab}(0) = 0.18{\mu}m. The nonintercalated samples can be modeled with either a single d-wavesuperconducting gap or with an anisotropic gap function based on recentquasiparticle imaging experiments, whereas the intercalates display multigapnodal behavior which can be fitted using s + d- or d + d-wave models.Magnetism, likely from iron impurities, appears after the intercalationreaction and coexists and competes with the superconductivity. However, itappears that the superconductivity is remarkably robust to the impurity phase,providing an avenue to stably improve the superconducting properties oftransition metal substituted FeSe.

Robustness of superconducting properties to transition metal substitution and impurity phases in Fe1-xVxSe