Superconductivity above 100 K in single-layer FeSe films on doped SrTiO3

2014/06/13 by Jian-Feng Ge, Zhi Long Liu, Zhi-Long Liu +6 · 7 citations
Materials Science · Physics and Astronomy · #Angle-resolved photoemission spectroscopy #Condensed matter physics #Doping #Electrical resistivity and conductivity #Electronic and Structural Properties of Oxides #Electronic structure #Iron-based superconductors research #Materials science #Nuclear magnetic resonance #Pairing #Photoemission spectroscopy #Physics #Physics of Superconductivity and Magnetism #Superconducting transition temperature #Superconductivity #X-ray photoelectron spectroscopy #cond-mat.supr-con

paper · pdf · doi:10.1038/nmat4153

published as Nature Materials |V14 , 285 (2015) · 10 pages, 3 figures, 7 pages supplementary materials

arxiv created 2014/06/13 · openalex publication_date 2014/11/24 · arxiv updated 2015/06/11 · openalex created_date 2025/10/10 · openalex updated_date 2026/08/05

Abstract

Recently, interface has been employed to enhance superconductivity in the single-layer FeSe films grown on SrTiO3(001)(STO) with a possible Tc of ~ 80 K, which is nearly ten times of the Tc of bulk FeSe and is above the Tc record of 56 K for the bulk Fe-based superconductors. This work together with those on superconducting oxides interfaces revives the long-standing idea that electron pairing at a two-dimensional (2D) interface between two different materials is a potential path to high transition temperature (Tc) superconductivity. Subsequent angle-resolved photoemission spectroscopy (ARPES) measurements revealed different electronic structure from those of bulk FeSe with a superconducting-like energy gap closing at around 65K. However, previous ex situ electrical transport measurements could only detect the zero-resistance below ~30 K. Here we report the observation of high Tc superconductivity in the FeSe/STO system. By in situ 4-point probe (4PP) electrical transport measurement that can be conducted at an arbitrary position of the FeSe film on STO, we detected superconductivity above 100 K. Our finding makes FeSe/STO the exciting and ideal research platform for higher Tc superconductivity.

Citations

• Interface induced high temperature superconductivity in single unit-cell FeSe films on SrTiO3
• Measurement of Sheet Resistivities with the Four-Point Probe

Cited by

• Physical limitations of the Hohenberg-Mermin-Wagner theorem
• Identifying the dominant pairing interaction in high-Tc FeSe superconductors through Leggett modes
• Unifying Variational and Dynamical Quantum Embedding: From Ghost Gutzwiller Approximation to Dynamical Mean-Field Theory
• Magnetic behavior of dirty multiband superconductors near the upper critical field
• Critical current density and vortex pinning in tetragonalFeS1−xSex(x=0,0.06)
• Surface electronic structure and isotropic superconducting gap in(Li0.8Fe0.2)OHFeSe
• Theoretical prediction of superconductivity in monolayer h-BN doped with alkaline-earth metals (Ca, Sr, Ba)
• Positive and negative chemical pressure effects investigated in electron-doped FeSe films with an electric-double-layer structure

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