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

Abstract

We performed systematic studies on the transport properties of FeSe thin films with controlled degrees of in-plane lattice strain, including both tensile and compressive strains. The superconducting transition temperature, $T_{\mathrm{c}}$, increases up to 12 K for films with compressive strain while the superconductivity disappears for films with large tensile strains. On the other hand, the structural (nematic) transition temperature, $T_{\mathrm{s}}$, slightly decreases as the in-plane strain is more compressive. This suggests that the structural transition can be extinguished by a smaller amount of Te substitution 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 carrier densities evaluated via transport properties increase as the in-plane strain becomes more compressive. A clear correlation between $T_{\mathrm{c}}$ and the carrier densities suggests that it is essential to increase carrier densities for the $T_{\mathrm{c}}$ enhancement of iron chalcogenides.

arXiv comment13 pages, 4 figures

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Cited by in corpus (17)

• Strain-tuning of nematicity and superconductivity in single crystals of FeSe
• Evolution of transport properties in FeSe thin flakes with thickness approaching the two-dimensional limit
• Phase diagrams on composition-spread Fe${}_y$Te${}_{1-x}$Se${}_x$ films
• Enhancement of superconducting transition temperature in electrochemically etched FeSe/LaAlO${}_3$ films
• Close correlation between superconducting transition temperatures and carrier densities in Te- and S-substituted FeSe thin films
• Control of band structure of FeSe single crystals via biaxial strain
• Interface superconductivity in FeSe thin films on SrTiO${}_3$grown by the PLD technique
• Molecular beam epitaxy of superconducting FeSe${}_x$Te${}_{1-x}$ thin films interfaced with magnetic topological insulators
• Pure nematic state in iron-based superconductor
• Relationships between Superconductivity and Nematicity in FeSe${}_{1-x}$Te${}_x$ ($x=0-0.5$) Films Studied by Complex Conductivity Measurements
• Charge carrier dynamics of FeSe thin film investigated by terahertz magneto-optical spectroscopy
• Anisotropy of upper critical fields and interface superconductivity in FeSe/SrTiO3 grown by PLD
• Sulfur-induced magnetism in FeSe${}_{1-x}$S${}_x$ thin films on LaAlO${}_3$ revealed by muon spin rotation/relaxation
• Studies of superconductivity of Fe chalcogenides in films grown by PLD technique
• Evolution of charge dynamics in FeSe${}_{1-x}$Te${}_x$: Effects of electronic correlations and nematicity
• Fabrication of oxide/FeSe multilayer films using the PLD technique
• What controls the superconducting dome of electron-doped FeSe?