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We performed systematic studies on the transport properties of FeSe thinfilms with controlled degrees of in-plane lattice strain, including bothtensile and compressive strains. The superconducting transition temperature,$T_{\mathrm c}$, increases up to 12 K for films with compressive strain whilethe superconductivity disappears for films with large tensile strains. On theother hand, the structural (nematic) transition temperature, $T_{\mathrm s}$,slightly decreases as the in-plane strain is more compressive. This suggeststhat the structural transition can be extinguished by a smaller amount of Tesubstitution for films with more compressive strain, which may lead to higher$T_{\mathrm c}$ in FeSe$_{1-x}$Te$_x$. It was also found that the carrierdensities evaluated via transport properties increase as the in-plane strainbecomes more compressive. A clear correlation between $T_{\mathrm c}$ and thecarrier densities suggests that it is essential to increase carrier densitiesfor the $T_{\mathrm c}$ enhancement of iron chalcogenides.

Systematic study on transport properties of FeSe thin films with various degrees of strain