Visualizing superconductivity in FeSe nanoflakes on SrTiO3 by scanning tunneling microscopy
Zhi Li, Jun-Ping Peng, Hui-Min Zhang, Can-Li Song, Shuai-Hua Ji, Lili Wang, Ke He, Xi Chen, Qi-Kun Xue, Xu-Cun Ma
DOI 10.1103/PhysRevB.91.060509 · Physical Review B
Active bibliographic source — not scientific approval
Bibliographic access preserves source history; it does not approve extracted materials or validate reported claims. Review warnings on each occurrence separately.
Abstract
Scanning tunneling microscopy and spectroscopy have been employed to investigate the superconductivity in single unit-cell FeSe nanoflakes on SrTiO3 substrates. We find that the differential conductance dI/dV spectra are spatially nonuniform and fluctuate within the flakes as their area is reduced to below ∼150nm2. An enhancement in the superconductivity-related gap size as large as 25% is observed. The superconductivity behavior disappears when the FeSe nanoflakes reduce to ∼40nm2. Compared to a previous report [Wang et al., Chin. Phys. Lett. 29, 037402 (2012)], the gap is asymmetric relative to the Fermi energy EF. All the features, particularly the fluctuating gap and quenched superconductivity, could be accounted for by quantum size effects. Our study helps to understand nanoscale superconductivity in low-dimensional systems.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
Similar papers
Superconducting transition of FeSe/SrTiO3 induced by adsorption of semiconducting organic molecules
similarity 0.96Jiaqi Guan et al.
Source status unknown — claims are unverified
Iron Vacancy Tunable Superconductor-Insulator Transition in FeSe/SrTiO3 Monolayer
similarity 0.95Cheng-Long Xue et al.
Source status unknown — claims are unverified
Oxygen vacancy modulated superconductivity in monolayer FeSe on SrTiO3−δ
similarity 0.95Guanming Gong et al.
Source status unknown — claims are unverified
Superconductivity of single unit cell FeSe/SrTiO3(001): Substrate-surface superstructure dependence
similarity 0.94Tomoaki Tanaka et al.
Source status unknown — claims are unverified
High-Temperature Superconductivity in Single-Unit-Cell FeSe Films on Anatase TiO2(001)
similarity 0.93Hao Ding et al.
Source status unknown — claims are unverified
Absence of superconductivity in ultrathin layers of FeSe synthesized on a topological insulator
similarity 0.93Andreas Eich et al.
Source status unknown — claims are unverified