Proximity induced superconductivity within the insulating (Li${}_{0.84}$Fe${}_{0.16}$)OH layers in (Li${}_{0.84}$Fe${}_{0.16}$)OHFe${}_{0.98}$Se

Abstract

The role played by the insulating intermediate (Li${}_{0.84}$Fe${}_{0.16}$)OH layer on magnetic and superconducting properties of (Li${}_{0.84}$Fe${}_{0.16}$)OHFe${}_{0.98}$Se was studied by means of muon-spin rotation. It was found that it is not only enhances the coupling between the FeSe layers for temperatures below $\simeq 10$ K, but becomes superconducting by itself due to the proximity to the FeSe ones. Superconductivity in (Li${}_{0.84}$Fe${}_{0.16}$)OH layers is most probably filamentary-like and the energy gap value, depending on the order parameter symmetry, does not exceed 1-1.5 meV.

5 pages, 3 figures. The Supplementary Information file is available upon request

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