Microstructural control of the transport properties of $\beta$-FeSe films grown by sputtering

Abstract

We have investigated the correlation between structural and transport properties in sputtered $\beta$-FeSe films grown onto SrTiO${}_3$ (100). The growth parameters, such as substrate temperature and thickness, have been varied in order to explore different regimes. In the limit of textured thick films, we found promising features like an enhanced $T_{\mathrm{c}}\sim 12$K, a relatively high $H_{c2}$ and a low anisotropy. By performing magnetoresistance and Hall coefficient measurements, we investigate the influence of the disorder associated with the textured morphology on some features attributed to subtle details of the multi-band electronic structure of $\beta$-FeSe. Regarding the superconductor-insulator transition (SIT) induced by reducing the thickness, we found a non-trivial evolution of the structural properties and morphology associated with a strained initial growth and the coalescence of grains. Finally, we discuss the origin of the insulating behavior in high-quality stressed epitaxial thin films. We found that a lattice distortion, described by the Poisson's coefficient associated with the lattice parameters \textit{a} and \textit{c}, may play a key role.

arXiv commentThis article has been accepted for publication in Journal of Applied Physics

References in corpus (28)

• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• Superconductivity at 36 K in beta-Fe1.01Se with the compression of the interlayer separation under pressure
• Interface-induced superconductivity and strain-dependent spin density wave in FeSe/SrTiO3 thin films
• Electronic Origin of High Temperature Superconductivity in Single-Layer FeSe Superconductor
• The Structural Phase Transition in FeSe (Fe1+dSe)
• Field-induced superconducting phase of FeSe in the BCS-BEC cross-over
• Dome-shaped magnetic order competing with high-temperature superconductivity at high pressures in FeSe
• Evolution of high-temperature superconductivity from low-Tc phase tuned by carrier concentration in FeSe thin flakes
• Origin of the tetragonal-to-orthorhombic (nematic) phase transition in FeSe: a combined thermodynamic and NMR study
• Lack of coupling between superconductivity and orthorhombic distortion in stoichiometric single-crystalline FeSe
• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3(110)
• Anomalous Fermi surface in FeSe seen by Shubnikov-de Haas oscillation measurements
• Dichotomy between the hole and electrons behavior in the multiband FeSe probed by ultra high magnetic fields
• Crystal orientation and thickness dependence of superconductivity on tetragonal FeSe1-x thin films
• Suppression of superconductivity in FeSe films under tensile strain
• Electric field-induced superconducting transition of insulating FeSe thin film at 35 K
• Fe-vacancy order and superconductivity in PbO-type tetragonal β-Fe1-xSe
• Enhancement of the Superconducting Transition Temperature in FeSe Epitaxial Thin Films by Anisotropic Compression
• Multiband effects on beta-FeSe single crystals
• Effects of strain on the electronic structure, superconductivity, and nematicity in FeSe studied by angle-resolved photoemission spectroscopy
• Thickness dependence of superconductivity and superconductor-insulator transition in ultrathin FeSe films on SrTiO3(001) substrate
• Interface control by homoepitaxial growth in pulsed laser deposited iron chalcogenide thin ilms
• Multiband character of $\beta$-FeSe: Angular dependence of the magnetoresistance and upper critical field
• Intrinsic pinning by naturally occurring correlated defects in FeSe${}_{\text{1-x}}$Te${}_{\text{x}}$ superconductors
• Insulator-like behavior coexisting with metallic electronic structure in strained FeSe thin films grown by molecular beam epitaxy
• Multiple energy gap features of superconducting FeSe investigated by tunneling spectroscopy
• High-throughput investigation of tunable superconductivity in FeSe films
• Vortex dynamics in $\beta$-FeSe single crystals: effects of proton irradiation and small inhomogeneous stress

Cited by in corpus (1)

• Impact of atomic defects in the electronic states of FeSe${}_{1-x}$S${}_x$ superconducting crystals