Pressure-induced superconductivity in parent CaFeAsF single crystals
Bo Gao, Yonghui Ma, Gang Mu, Hong Xiao
DOI 10.1103/PhysRevB.97.174505 · 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
Flouroarsenide CaFeAsF is a parent compound of the 1111 type of iron-based superconductors. It is similar to the parent LaFeAsO, but it is oxygen-free. To date, studies of pressure-induced effects have only focused on pure and doped polycrystalline CaFeAsF samples. Here, we carried out high-pressure electrical resistivity and Hall coefficient measurements up to 48.2 GPa on single crystals of CaFeAsF. The structural transition temperature Tstr decreased monotonically upon increasing the pressure, and reached ∼60K at 9.6 GPa. Superconductivity emerged suddenly at 8.6 GPa with the Tc,onset∼25.7K, which decreased monotonically with increasing pressure to 5.7 K under 48.2 GPa. Moreover, just after the appearance of superconductivity, the Hall coefficient at 40 K started to decrease with increasing pressure, while keeping its sign negative persisting up to 48.2 GPa.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| CaFeAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 25.7 | 8.6 GPa | onset |
| CaFeAsF Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 5.7 | 48.2 GPa | onset |
| LaFeAsO Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 22 | 12 GPa | unknown |
Similar papers
Pressure Induced Superconductivity in CaFe2As2
similarity 0.96Milton S. Torikachvili et al.
Source status unknown — claims are unverified
Pressure-induced superconducting state of antiferromagnetic CaFe2As2
similarity 0.96Hanoh Lee et al.
Source status unknown — claims are unverified
Superconductivity at 23 K and low anisotropy in Rb-substituted BaFe2As2 single crystals
similarity 0.94Z. Bukowski et al.
Source status unknown — claims are unverified
Pressure-temperature phase diagrams of CaK(Fe1−xNix)4As4 superconductors
similarity 0.94Li Xiang et al.
Source status unknown — claims are unverified
Evolution of the bulk properties, structure, magnetic order, and superconductivity with Ni doping in CaFe2−xNixAs2
similarity 0.94Neeraj Kumar et al.
Source status unknown — claims are unverified
Superconductivity in LaFe1−xCoxAsO
similarity 0.94Athena S. Sefat et al.
Source status unknown — claims are unverified