Molecular-beam epitaxy and robust superconductivity of stoichiometric FeSe crystalline films on bilayer graphene
Authors:
- Can-Li SongCSCan-Li Song
- Yi-Lin WangYWYi-Lin Wang
- Ye-Ping JiangYJYe-Ping Jiang
- Zhi LiZhi Li
- Lili WangLWLili Wang
- Ke HeKHKe He
- Xi ChenXCXi Chen
- Xu-Cun MaXMXu-Cun Ma
- Qi-Kun XueQXQi-Kun Xue
- 12 July 2011
- journal article
- research article
- Published by American Physical Society (APS) in Physical Review B
- Vol. 84 (2)
Abstract
We report on molecular beam epitaxy growth of stoichiometric and superconducting FeSe crystalline thin films on double-layer graphene. Layer-by-layer growth of high-quality films has been achieved in a well-controlled manner by using Se-rich condition, which allow us to investigate the thickness-dependent superconductivity of FeSe. In situ low-temperature scanning tunneling spectra reveal that the local superconducting gap in the quasiparticle density of states is visible down to two triple layers for the minimum measurement temperature of 2.2 K, and that the transition temperature Tc scales inversely with film thickness.Keywords
This publication has 23 references indexed in Scilit:
- The puzzle of high temperature superconductivity in layered iron pnictides and chalcogenidesAdvances in Physics, 2010
- High-temperature superconductivity in iron-based materialsNature Physics, 2010
- Crystal Orientation and Thickness Dependence of the Superconducting Transition Temperature of TetragonalThin FilmsPhysical Review Letters, 2009
- Suppression of superconductivity in FeSe films under tensile strainApplied Physics Letters, 2009
- Electronic and magnetic phase diagram of β-Fe1.01Se with superconductivity at 36.7 K under pressureNature Materials, 2009
- Preparation and superconductivity of iron selenide thin filmsJournal of Physics: Condensed Matter, 2009
- The development of the superconducting PbO-type β-FeSe and related compoundsPhysica C: Superconductivity and its Applications, 2009
- Extreme sensitivity of superconductivity to stoichiometry inPhysical Review B, 2009
- Superconductivity at 27K in tetragonal FeSe under high pressureApplied Physics Letters, 2008
- Superconductivity in the PbO-type structure α-FeSeProceedings of the National Academy of Sciences, 2008