High-temperature superconductivity in one-unit-cell FeSe films

Abstract

Since the dramatic interface enhancement of superconducting transition temperature (Tc) was reported in one unit-cell FeSe film grown on SrTiO3 substrate (1-UC FeSe/STO) by molecular beam epitaxy (MBE), related research on this system has become a new frontier in condensed matter physics. In this paper, we present a brief review on this rapidly developing field, mainly focusing on the superconducting properties of 1-UC FeSe/STO. Experimental evidences for the high-temperature superconductivity in 1-UC FeSe/STO, including the direct evidences revealed by transport and diamagnetic measurements, and other evidences from scanning tunneling microscope (STM) and angle-resolved photoemission spectroscopy (ARPES), are overviewed. Potential mechanisms of the enhanced superconductivity are discussed. There are accumulating arguments suggesting that the strengthened Cooper pairing in 1-UC FeSe/STO originates from the interface effects, specifically charge transfer and coupling to phonon modes in TiO2 plane. The study of superconductivity in 1-UC FeSe/STO not only sheds a new light on the mechanism of high-temperature superconductors with layered structures, but also provides the insight to explore new superconductors by interface engineering.

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Cited by in corpus (38)

• Magic-angle graphene superlattices: a new platform for unconventional superconductivity
• Tunable Phase Boundaries and Ultra-Strong Coupling Superconductivity in Mirror Symmetric Magic-Angle Trilayer Graphene
• Nematicity, magnetism and superconductivity in FeSe
• The key ingredients of the electronic structure of FeSe
• On the Remarkable Superconductivity of FeSe and its Close Cousins
• Exotic Superconducting States in FeSe-based Materials
• Dynamic interfacial polaron enhanced superconductivity of FeSe/SrTiO3
• When Superconductivity Crosses Over: From BCS to BEC
• On the origin of critical temperature enhancement in atomically-thin superconductors
• Suppression of superconductivity and enhanced critical field anisotropy in thin flakes of FeSe
• Tuning the electronic structure of α-antimonene monolayer through interface engineering
• Strain-tuning of nematicity and superconductivity in single crystals of FeSe
• Zero-energy bound states in the high-temperature superconductors at the two-dimensional limit
• Lattice Dynamics of Ultrathin FeSe Films on SrTiO3
• Detection of bosonic mode as a signature of magnetic excitation in one unit cell FeSe on SrTiO3
• Bulk superconductivity and role of fluctuations in the iron-based superconductor FeSe at high pressures
• Itinerant approach to magnetic neutron scattering of FeSe: effect of orbital selectivity
• Unconventional pairing in single FeSe layers
• In Situ STM Observation of Nonmagnetic Impurity Effect in MBE-grown CeCoIn${}_5$ Films
• Direct evidence of superconductivity and determination of the superfluid density in buried ultrathin FeSe grown on SrTiO${}_3$
• Identification of a Large Amount of Excess Fe in Superconducting Single-Layer FeSe/SrTiO3 Films
• Insulator-like behavior coexisting with metallic electronic structure in strained FeSe thin films grown by molecular beam epitaxy
• Preliminary Tc calculations for iron-based superconductivity in NaFeAs, LiFeAs, FeSe and nanostructured FeSe/SrTiO3 Superconductors
• Role of electric fields on enhanced electron correlation in surface-doped FeSe
• Insulating Parent Phase and Distinct Doping Evolution to Superconductivity in Single-Layer FeSe/SrTiO3 Films
• Orbital-Selective High-Temperature Cooper Pairing Developed in the Two-Dimensional Limit
• Capping layer influence and isotropic in-plane upper critical field of the superconductivity at the FeSe/SrTiO3 interface
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• Theory of Superconductivity Mediated by Topological Phonons
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• Field misalignment effect on the in-plane magnetoresistance in the high-temperature superconductor FeSe/SrTiO3