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

Abstract

In order to investigate the effects of in-plane strain on the superconductivity of FeSe, epitaxial thin films of FeSe were fabricated on CaF${}_2$ substrates. The films are compressed along the a-axis and their superconducting transition temperatures $T_{\mathrm{c}}^{\mathrm{zero}}$ reach 11.4 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 lattice constants, $c$ / $a$, compared to that of Fe(Se,Te). Our results indicate that even a binary system FeSe has room for improvement, and will open a new route for the application of Fe-based superconductors.

4 pages, 3 figures

References in corpus (11)

• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Extreme Sensitivity of Superconductivity to Stoichiometry in FeSe (Fe1+dSe)
• Effect of Structural Parameters on Superconductivity in Fluorine-Free LnFeAsO1-y (Ln=La,Nd)
• A review of Fe-chalcogenide superconductors: the simplest Fe-based superconductor
• Suppression of superconductivity in FeSe films under tensile strain
• Systematic Comparison of Eight Substrates in the Growth of FeSe${}_{0.5}$Te${}_{0.5}$ Superconducting Thin Films
• Epitaxial growth of FeSe${}_{0.5}$Te${}_{0.5}$ thin films on CaF${}_2$ substrates with high critical current density
• Preparation and superconductivity of iron selenide thin films
• Superconductivity at 5.4 K in $\beta$-Bi${}_2$Pd
• Synthesis, crystal structure and magnetism of beta-Fe1.00(2)Se1.00(3) single crystals
• Synthesis, structural and physical properties of ${\delta }^{\prime }$-FeSe${}_{1-x}$

Cited by in corpus (16)

• Electronic Structure and Superconductivity of FeSe-Related Superconductors
• Suppression of phase separation and giant enhancement of superconducting transition temperature in FeSe${}_{1-x}$Te${}_x$ thin films
• Effects of strain on the electronic structure, superconductivity, and nematicity in FeSe studied by angle-resolved photoemission spectroscopy
• Suppression of superconductivity and enhanced critical field anisotropy in thin flakes of FeSe
• Strain-tuning of nematicity and superconductivity in single crystals of FeSe
• Systematic study on transport properties of FeSe thin films with various degrees of strain
• Growth of superconducting epitaxial films of sulfur substituted FeSe via pulsed laser deposition
• Band structure and charge doping effects of potassium-adsorbed FeSe/SrTiO3 system
• Investigation of Transport Properties for FeSe${}_{1-x}$Te${}_x$ Thin Films under Magnetic Fields
• Insulator-like behavior coexisting with metallic electronic structure in strained FeSe thin films grown by molecular beam epitaxy
• Superconducting fluctuations in FeSe${}_{0.5}$Te${}_{0.5}$ thin films probed via microwave spectroscopy
• Microstructural control of the transport properties of $\beta$-FeSe films grown by sputtering
• Multiple energy gap features of superconducting FeSe investigated by tunneling spectroscopy
• Sulfur-induced magnetism in FeSe${}_{1-x}$S${}_x$ thin films on LaAlO${}_3$ revealed by muon spin rotation/relaxation
• Stabilization and heteroepitaxial growth of metastable tetragonal FeS thin films by pulsed laser deposition
• Growth and microwave properties of FeSe thin films and comparison with Fe(Se,Te)