Effects of aging processes at the surface of the superconductor β−FeSe
L. Lanoël, G. Rozas, A. E. Bruchhausen, M. L. Amigó, M. V. Ale Crivillero, J. A. Hofer, M. Villafuerte, G. Bridoux, S. Bengió, G. Nieva
DOI 10.1103/PhysRevB.106.214507 · 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
This work reports a complete analysis of surface degradation in β−FeSe single crystals; which includes the dependence on aging and temperature of Raman spectra, electrical transport resistivity, and XPS depth profiling characterization. All measurements are consistent with the emergence of clusters of Se and the presence of FeOx in the surface of the crystals. The vibrational modes of the Se clusters are coupled to the β−FeSe ones as seen in the structural transition. Moreover, this degraded surface can behave like a quasi-two-dimensional layer, as supported by a theoretical model and also consistent with Raman spectra. While the degradation of thin films of β−FeSe in air is widely known, with a corresponding loss of the superconducting properties, in single crystals with aged surfaces we observe an enhancement of the superconducting properties.
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. | 8 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 37 | 9 GPa | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 8.4 | Pressure not reported | onset |
Similar papers
Evolution of the superconducting properties in FeSe1−xSx
similarity 0.96S. A. Moore et al.
Source status unknown — claims are unverified
Normal and superconducting state properties of Cu-doped FeSe single crystals
similarity 0.96Chunsheng Gong (龚春生) et al.
Source status unknown — claims are unverified
Discrete Superconducting Phases in FeSe-Derived Superconductors
similarity 0.96T. P. Ying et al.
Source status unknown — claims are unverified
Superconductivity in FeSe: The Role of Nematic Order
similarity 0.96Jian Kang et al.
Source status unknown — claims are unverified
Bulk Superconductivity and Role of Fluctuations in the Iron-Based Superconductor FeSe at High Pressures
similarity 0.96Elena Gati et al.
Source status unknown — claims are unverified
Disorder-robust high-field superconducting phase of FeSe single crystals
similarity 0.96Nan Zhou et al.
Source status unknown — claims are unverified