Fermi-liquid state and enhanced electron correlations in the iron pnictide CaFe4 As3

Liang L. Zhao, Tanghong Yi, James C. Fettinger, Susan M. Kauzlarich, E. Morosan

Research output: Contribution to journalArticle

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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 languageEnglish (US)
Article number020404
JournalPhysical Review B - Condensed Matter and Materials Physics
Volume80
Issue number2
DOIs
StatePublished - Aug 6 2009

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Fermi liquids
Electron correlations
Group 5A compounds
Iron
specific heat
magnetic permeability
iron
display devices
Specific heat
electrons
fermions
Spin density waves
Temperature
electrical resistivity
Fermions
coefficients
Magnetic susceptibility
electronics
Wood
temperature

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electronic, Optical and Magnetic Materials

Cite this

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 journalArticle

Zhao, Liang L. ; Yi, Tanghong ; Fettinger, James C. ; Kauzlarich, Susan M. ; Morosan, E. / Fermi-liquid state and enhanced electron correlations in the iron pnictide CaFe4 As3 In: Physical Review B - Condensed Matter and Materials Physics. 2009 ; Vol. 80, No. 2.
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