High temperature superconducting FeSe films on SrTiO3 substrates

Abstract

Interface enhanced superconductivity at two dimensional limit has become one of most intriguing research directions in condensed matter physics. Here, we report the superconducting properties of ultra-thin FeSe films with the thickness of one unit cell (1-UC) grown on conductive and insulating SrTiO3 (STO) substrates. For the 1-UC FeSe on conductive STO substrate (Nb-STO), the magnetization versus temperature (M-T) measurement shows a diamagnetic signal at 85 K, suggesting the possibility of superconductivity appears at this high temperature. For the FeSe films on insulating STO substrate, systematic transport measurements were carried out and the sheet resistance of FeSe films exhibits Arrhenius TAFF behavior with a crossover from a single-vortex pinning region to a collective creep region. More intriguing, sign reversal of Hall resistance with temperature is observed, demonstrating a crossover from hole conduction to electron conduction above Tc in 1-UC FeSe films.

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Cited by in corpus (18)

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• Electronic Structure and Superconductivity of FeSe-Related Superconductors
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Two-dimensional Superconductors with Atomic-scale Thicknesses
• High-temperature superconductivity in one-unit-cell FeSe films
• Interface high-temperature superconductivity
• Synergetic Behavior in 2D Layered Material/Complex Oxide Heterostructures
• Oxygen Vacancy Induced Flat Phonon Mode at FeSe /SrTiO3 interface
• New Alkali-Metal- and 2-Phenethylamine-Intercalated Superconductors $A_x$(C${}_8$H${}_{11}$N)${}_y$Fe${}_{1-z}$Se ($A$ = Li, Na) with the Largest Interlayer Spacings and $T_{\mathrm{c}}$ $\sim$ 40 K
• Understanding doping, vacancy, lattice stability and superconductivity in KxFe2-ySe2
• Evolution of transport properties in FeSe thin flakes with thickness approaching the two-dimensional limit
• Monolayer superconductivity and tunable topological electronic structure at the Fe(Te,Se)/Bi2Te3 interface
• Magnetic neutron scattering studies on the Fe-based superconductor system Fe${}_{1+y}$Te${}_{1-x}$Se${}_x$
• Molecular Beam Epitaxy Growth of Tetragonal FeS Film on SrTiO3(001) Substrate
• Studies of superconductivity of Fe chalcogenides in films grown by PLD technique
• Superconductor-polariton non-dissipative drag in optical microcavity
• The Anisotropy of Thermal Activation Energy of 2H-NbS${}_2$