title: Two-dimensional superfluid density in an alkali metal-organic solvent intercalated iron selenide superconductor Li(C5H5N)0.2Fe2Se2.
abstract: We report the low-temperature electronic and magnetic properties of the alkali metal-organic solvent intercalated iron selenide superconductor Li(C5H5N)0.2Fe2Se2 using muon-spin-spectroscopy measurements. The zero-field muon spin relaxation (μSR) results indicate that nearly half of the sample is magnetically ordered and spatially phase separated from the superconducting region. The transverse-field μSR results reveal that the superfluid density of Li(C5H5N)0.2Fe2Se2 is two dimensional in nature. The temperature dependence of the penetration depth λ(T) can be explained using a two-gap s-wave model. This implies that, despite the 2D nature of the superfluid density, the symmetry of the superconducting gap remains unaltered to the parent compound FeSe.
authors.affiliation: Laboratory for Muon Spin Spectroscopy, Paul Scherrer Institute, CH-5232 Villigen PSI, Switzerland. pabitra.biswas@psi.ch
authors.forename: P K
authors.initials: PK
authors.lastname: Biswas
authors.forename: A
authors.initials: A
authors.lastname: Krzton-Maziopa
authors.forename: R
authors.initials: R
authors.lastname: Khasanov
authors.forename: H
authors.initials: H
authors.lastname: Luetkens
authors.forename: E
authors.initials: E
authors.lastname: Pomjakushina
authors.forename: K
authors.initials: K
authors.lastname: Conder
authors.forename: A
authors.initials: A
authors.lastname: Amato