Fermi-liquid state and enhanced electron correlations in the iron pnictide CaFe4As3
Liang L. Zhao, Tanghong Yi, James C. Fettinger, Susan M. Kauzlarich, E. Morosan
DOI 10.1103/PhysRevB.80.020404 · Physical Review B
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Abstract
The recently discovered CaFe4As3 system displays low-temperature Fermi-liquid behavior, with enhanced electron-electron correlations. At high temperatures, the magnetic susceptibility shows Curie-Weiss behavior, with a large temperature-independent contribution. Antiferromagnetic ordering is observed below TN=(88.0±1.0) K, possibly via a spin density wave transition. A remarkably sharp drop in resistivity occurs below T2=(26.4±1.0) K, correlated with a similarly abrupt increase in the susceptibility but no visible feature in the specific heat. The electronic specific-heat coefficient γ at low temperatures is close to 0.02 J molFe−1 K−2, but a higher value for γ∼0.08 J molFe−1 K−2 can be inferred from a linear Cp/T vs T2 just above T2. The Kadowaki-Woods ratio A/γ2=55∗10−5 μΩ cm mol2 K2 mJ−2 is nearly two orders of magnitude larger than that of heavy fermions.
Source-reported materials — not catalogue approval
| Formula | Reported Tc (K) | Pressure (GPa) | Type |
|---|---|---|---|
| La(O/F)FeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| BaFe2As2 Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| FeSe Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
| LiFeAs Archive — visibility unverified Source-occurrence policy only; no material identity or catalogue acceptance is inferred from the formula. | — | Pressure not reported | unknown |
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