Abstract
The recently discovered CaFe4 As3 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 0.02J mol Fe -1 K-2, but a higher value for γ∼0.08J mol Fe -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 μΩcm mol2 K2 mJ-2 is nearly two orders of magnitude larger than that of heavy fermions.
| Original language | English (US) |
|---|---|
| Article number | 020404 |
| Journal | Physical Review B - Condensed Matter and Materials Physics |
| Volume | 80 |
| Issue number | 2 |
| DOIs | |
| State | Published - Aug 6 2009 |
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ASJC Scopus subject areas
- Condensed Matter Physics
- Electronic, Optical and Magnetic Materials
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Fermi-liquid state and enhanced electron correlations in the iron pnictide CaFe4 As3 . / Zhao, Liang L.; Yi, Tanghong; Fettinger, James C.; Kauzlarich, Susan M.; Morosan, E.
In: Physical Review B - Condensed Matter and Materials Physics, Vol. 80, No. 2, 020404, 06.08.2009.Research output: Contribution to journal › Article
}
TY - JOUR
T1 - Fermi-liquid state and enhanced electron correlations in the iron pnictide CaFe4 As3
AU - Zhao, Liang L.
AU - Yi, Tanghong
AU - Fettinger, James C.
AU - Kauzlarich, Susan M.
AU - Morosan, E.
PY - 2009/8/6
Y1 - 2009/8/6
N2 - The recently discovered CaFe4 As3 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 0.02J mol Fe -1 K-2, but a higher value for γ∼0.08J mol Fe -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 μΩcm mol2 K2 mJ-2 is nearly two orders of magnitude larger than that of heavy fermions.
AB - The recently discovered CaFe4 As3 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 0.02J mol Fe -1 K-2, but a higher value for γ∼0.08J mol Fe -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 μΩcm mol2 K2 mJ-2 is nearly two orders of magnitude larger than that of heavy fermions.
UR - http://www.scopus.com/inward/record.url?scp=69649088963&partnerID=8YFLogxK
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U2 - 10.1103/PhysRevB.80.020404
DO - 10.1103/PhysRevB.80.020404
M3 - Article
VL - 80
JO - Physical Review B-Condensed Matter
JF - Physical Review B-Condensed Matter
SN - 0163-1829
IS - 2
M1 - 020404
ER -