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We report the low-temperature electronic and magnetic properties of thealkali metal-organic solvent intercalated iron selenide superconductorLix(C5H5N)yFe2-zSe using muon-spin-spectroscopy measurements. The zero-field\muSR results indicate that nearly half of the sample is magnetically orderedand there is a spatial phase separation between the superconducting and themagnetic fraction. The transverse-field \muSR results show that the temperaturedependence of the penetration depth \lambda(T) in the mixed state ofLix(C5H5N)yFe2-zSe can be explained using a two-gap s+s-wave model with gapvalues of 6.82(92) and 0.93(7) meV. This implies that the symmetry of thesuperconducting gap in this system remains unaltered to the parent compoundFeSe even after the intercalation with the molecular spacer layer. We obtain\lambda (0) = 485(21) nm at T = 0 K.

physical review letters

Magnetic phase separation and superfluid density measurements in alkali  metal-organic solvent intercalated iron selenide superconductor  Lix(C5H5N)yFe2-zSe2