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 (12)

• 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
• On the origin of critical temperature enhancement in atomically-thin superconductors
• Tuning the electronic structure of α-antimonene monolayer through interface engineering
• Lattice Dynamics of Ultrathin FeSe Films on SrTiO3
• 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
• Role of electric fields on enhanced electron correlation in surface-doped FeSe
• The interactions between antiferromagnetism, tetrahedral sites and electron-phonon coupling in FeSe1-xTex and FeSe/SrTiO3