Spatial inhomogeneity of superconducting gap in epitaxial monolayer FeTe1-x Sex films

Liu，Yaowu1; Li，Luxin2; Xie，Zheng1; Zhang，Zichun1; Chen，Sidan1; Ji，Lichen1; Chen，Wei1; Zhou，Xinyu1; Hu，Xiaopeng1; Chen，Xi1,3; Xue，Qi Kun1,3,4,5; Ji，Shuai Hua1,3

2023-12-01

10.1103/PhysRevB.108.214514

Physical Review B   影响因子和分区

2469-9950

2469-9969

Monolayer FeTe1-xSex films grown on a SrTiO3(001) substrate is a promising platform to explore both high-temperature and topological superconductivity. Using molecular beam epitaxy, we successfully synthesized monolayer FeTe1-xSex films (0≤x≤1) on a Nb-doped SrTiO3(001) substrate. The as-grown films with 0.30≤x≤1 show superconductivity. By spatially mapping the superconducting gap distribution, we found a large gap variation of ∼3-7meV. Our analysis shows that impurities/defects and local chemical composition variation play a minor role in the superconducting gap inhomogeneity. The large gap variation is possibly attributed to the joint effects of the interface inhomogeneity and inhomogeneous superfluid. Our study sheds light on the fundamental properties of two-dimensional iron-based superconductors.

EI ; SCI

英语

NI期刊

其他

20235115234094

Iron compounds ; Iron-based Superconductors ; Molecular beam epitaxy ; Niobium compounds ; Selenium compounds ; Strontium titanates ; Superconducting films ; Tellurium compounds ; Titanium compounds

Superconducting Materials:708.3 ; High Temperature Superconducting Materials:708.3.1 ; Chemical Products Generally:804 ; Atomic and Molecular Physics:931.3 ; Crystal Growth:933.1.2

PHYSICS

2-s2.0-85179763550

Scopus

1.State Key Laboratory of Low-Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing,100084,China
2.Quantum Science Center,Shenzhen,Guangdong-Hong Kong-Macao Greater Bay Area,518048,China
3.Frontier Science Center for Quantum Information,Beijing,100084,China
4.Beijing Academy of Quantum Information Sciences,Beijing,100193,China
5.Department of Physics,Southern University of Science and Technology,Shenzhen,518055,China

Liu，Yaowu,Li，Luxin,Xie，Zheng,et al. Spatial inhomogeneity of superconducting gap in epitaxial monolayer FeTe1-x Sex films[J]. Physical Review B,2023,108(21).

Liu，Yaowu.,Li，Luxin.,Xie，Zheng.,Zhang，Zichun.,Chen，Sidan.,...&Ji，Shuai Hua.(2023).Spatial inhomogeneity of superconducting gap in epitaxial monolayer FeTe1-x Sex films.Physical Review B,108(21).

Liu，Yaowu,et al."Spatial inhomogeneity of superconducting gap in epitaxial monolayer FeTe1-x Sex films".Physical Review B 108.21(2023).