22 K superconductivity in BaFe2As2 exposed to F2
G. N. Tam, Hiraku Maruyama, Juan C. Nino, G. R. Stewart
DOI 10.1103/PhysRevB.102.134507 · 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
Several previous reports on undoped AEFe2As2 (AE= alkaline earth metal) point to drops in resistivity indicative of possible superconductivity and some degree of Meissner effect in the magnetic susceptibility. Also, based on both resistivity and magnetic susceptibility measurements, controlled exposure to water vapor has been shown to induce superconductivity in AEFe2As2. In our study, BaFe2As2 single crystals grown using the self-flux method showed a full resistive drop around 22 K and magnetic shielding, when exposed to fluorine gas postgrowth. Our measurements indicate electron (donor) doping via atomic substitution of F for As is concurrent with the observed superconductivity, which sheds light on the likely effect of exposure to water vapor in previous work. Like doping experiments (such as substitution of Co for Fe, P for As, or K for Ba) in AEFe2As2 to date, the present work is consistent with suppression of the spin density wave transition coincident with the appearance of Tc. In addition to answering the puzzle of superconductivity in undoped or water vapor exposed AEFe2As2, our results also represent a fast (20 min exposure to 5% F in He) and reliable method suitable for inducing superconductivity in thin films of AEFe2As2. Some supportive work on BaFe2As2 exposed to Cl2 is also presented.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | Pressure not reported | onset |
| LaFePO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 6 | Pressure not reported | unknown |
| 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 |
Similar papers
Upper critical field, anisotropy, and superconducting properties of Ba1−xKxFe2As2 single crystals
similarity 0.96Zhao-Sheng Wang et al.
Source status unknown — claims are unverified
Evolution of the Fermi Surface of BaFe2(As1−xPx)2 on Entering the Superconducting Dome
similarity 0.96H. Shishido et al.
Source status unknown — claims are unverified
Superconductivity at 38 K in the Iron Arsenide (Ba1−xKx)Fe2As2
similarity 0.95Marianne Rotter et al.
Source status unknown — claims are unverified
Superconductivity at 23 K and low anisotropy in Rb-substituted BaFe2As2 single crystals
similarity 0.95Z. Bukowski et al.
Source status unknown — claims are unverified
Superconductivity in Ir-doped LaFe1−xIrxAsO
similarity 0.95Yanpeng Qi et al.
Source status unknown — claims are unverified
P31 and A75s NMR evidence for a residual density of states at zero energy in superconducting BaFe2(As0.67P0.33)2
similarity 0.95Yusuke Nakai et al.
Source status unknown — claims are unverified