Unconventional Superconductivity in the Layered Iron Germanide YFe2Ge2
Jiasheng Chen, Konstantin Semeniuk, Zhuo Feng, Pascal Reiss, Philip Brown, Yang Zou, Peter W. Logg, Giulio I. Lampronti, F. Malte Grosche
DOI 10.1103/PhysRevLett.116.127001 · Physical Review Letters
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Abstract
The iron-based intermetallic YFe2Ge2 stands out among transition metal compounds for its high Sommerfeld coefficient of the order of 100 mJ/(mol K2), which signals strong electronic correlations. A new generation of high quality samples of YFe2Ge2 show superconducting transition anomalies below 1.8 K in thermodynamic, magnetic, and transport measurements, establishing that superconductivity is intrinsic in this layered iron compound outside the known superconducting iron pnictide or chalcogenide families. The Fermi surface geometry of YFe2Ge2 resembles that of KFe2As2 in the high pressure collapsed tetragonal phase, in which superconductivity at temperatures as high as 10 K has recently been reported, suggesting an underlying connection between the two systems.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| YFe2Ge2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.8 | Pressure unresolved | onset |
| YFe2Ge2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.8 | Pressure unresolved | onset |
| YFe2Ge2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 1.8 | Pressure unresolved | onset |
| KFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | 10 | 21 GPa | unknown |
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