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In order to investigate the effects of in-plane strain on thesuperconductivity of FeSe, epitaxial thin films of FeSe were fabricated onCaF$_2$ substrates. The films are compressed along the a-axis and theirsuperconducting transition temperatures $T_{\mathrm c}^{\mathrm {zero}}$ reach11.4 K, which is approximately 1.5 times higher than that of bulk crystals. The$T_{\mathrm c}$ values are weakly dependent on the ratio of the latticeconstants, $c$ / $a$, compared to that of Fe(Se,Te). Our results indicate thateven a binary system FeSe has room for improvement, and will open a new routefor the application of Fe-based superconductors.

Enhancement of the Superconducting Transition Temperature in FeSe Epitaxial Thin Films by Anisotropic Compression