Superconductivity in solid-state synthesized (Li,Fe)OHFeSe by tuning Fe vacancies in FeSe layer
G. B. Hu, N. Z. Wang, M. Z. Shi, F. B. Meng, C. Shang, L. K. Ma, X. G. Luo, X. H. Chen
DOI 10.1103/PhysRevMaterials.3.064802 · Physical Review Materials
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
The discovery of iron-based superconductors (FeSCs) has attracted worldwide attention in recent years due to their abundant properties. Recently, an air-stable high-Tc FeSe-based superconductor, (Li,Fe)OHFeSe, was discovered, and it is thought to be an ideal platform for investigating the underlying physics of superconductivity. In this paper, we report on the solid-state synthesis of (Li,Fe)OHFeSe at low temperature. As-synthesized (Li,Fe)OHFeSe is nonsuperconducting, which can be attributed to the Fe vacancies in the FeSe layer. After annealing at high pressure or a solid-state reaction with lithium, the Fe vacancies in the FeSe layer can be eliminated, and superconductivity at 40 K is induced. X-ray photoelectron spectroscopy analysis also proves the decrease of the Fe valence, which indicates that the Fe vacancies are gradually eliminated upon annealing at high pressure or the solid-state reaction with lithium. Our finding suggests that the solid-state synthesis of (Li,Fe)OHFeSe after annealing at high pressure or the solid-state reaction with lithium can effectively eliminate the Fe vacancies in the FeSe layer, eventually inducing superconductivity in (Li,Fe)OHFeSe.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| LaFeAsO1-xFx Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 26 | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | Pressure not reported | unknown |
| Li0.8Fe0.2OHFeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 43 | Pressure not reported | unknown |
| (Li,Fe)OHFeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 40 | Pressure not reported | unknown |
Similar papers
Discrete superconducting phases in proton-intercalated FeSe thin flakes
similarity 0.97W. X. Wang et al.
Source status unknown — claims are unverified
Superconductivity and phase diagram of (Li0.8Fe0.2)OHFeSe1−xSx
similarity 0.97X. F. Lu et al.
Source status unknown — claims are unverified
Extreme sensitivity of superconductivity to stoichiometry in Fe1+δSe
similarity 0.97T. M. McQueen et al.
Source status unknown — claims are unverified
Superconductivity in LaFe1−xCoxAsO
similarity 0.97Athena S. Sefat et al.
Source status unknown — claims are unverified
Structural analysis and superconductivity of CeFeAsO1−xHx
similarity 0.97Satoru Matsuishi et al.
Source status unknown — claims are unverified
Superconductivity, magnetism, and stoichiometry of single crystals of Fe1+y(Te1−xSx)z
similarity 0.97Rongwei Hu et al.
Source status unknown — claims are unverified