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Superconducting (Li1-xFex)OHFe1-ySe films are attractive for both the basicresearch and practical application. However, the conventional vapor depositiontechniques are not applicable in synthesizing the films of such a complexsystem. So no intrinsic charge transport measurements on the films areavailable so far to reveal the nature of charge carriers, which is fundamentalto understanding the iron-based superconductivity mechanism. Herein we report asoft chemical film technique (matrix-assisted hydrothermal epitaxial growth),by which we have succeeded in growing a series of (Li1-xFex)OHFe1-ySe filmscovering the whole superconducting regime, with the superconducting transitiontemperature (Tc) from 4 K up to 42 K. This film technique opens up a new wayfor fabricating other complex functional materials as well. Furthermore, oursystematic transport investigation on the film samples indicates that both theelectron and hole carriers contribute to the charge transport, with thescattering rates deviating from the Fermi liquid. We find that thesuperconductivity occurs upon the electron and hole mobility becomingdivergent. And in the high Tc samples, the electron carriers are found muchmore mobile than the holes, a feature distinct from the low Tc samples. Hence,our transport results provide key insights into the underlying physics foriron-based high-Tc superconductivity.

Matrix-assisted fabrication and exotic charge mobility of (Li,Fe)OHFeSe superconductor films