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Two-Dimensional Superfluid Density in an Alkali Metal-Organic Solvent Intercalated Iron Selenide Superconductor<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mi>Li</mml:mi><mml:mo stretchy="false">(</mml:mo><mml:msub><mml:mi mathvariant="bold">C</mml:mi><mml:mn>5</mml:mn></mml:msub><mml:msub><mml:mi mathvariant="bold">H</mml:mi><mml:mn>5</mml:mn></mml:msub><mml:mi mathvariant="bold">N</mml:mi><mml:msub><mml:mo stretchy="false">)</mml:mo><mml:mn>0.2</mml:mn></mml:…
We report the low-temperature electronic and magnetic properties of the alkali metal-organic solvent intercalated iron selenide superconductor $\mathrm{Li}({\mathrm{C}}_{5}{\mathrm{H}}_{5}\mathrm{N}{)}_{0.2}{\mathrm{Fe}}_{2}{\mathrm{Se}}_{2}$ using muon-spin-spectroscopy measurements. The zero-field muon spin relaxation ($\ensuremath{\mu}\mathrm{SR}$) results indicate that nearly half of the sample is magnetically ordered and spatially phase separated from the superconducting region. The transverse-field $\ensuremath{\mu}\mathrm{SR}$ results …