A novel non-Fermi-liquid state in the iron-pnictide FeCrAs

Abstract

We report transport and thermodynamic properties of stoichiometric single crystals of the hexagonal iron-pnictide FeCrAs. The in-plane resistivity shows an unusual "non-metallic" dependence on temperature T, rising continuously with decreasing T from ~ 800 K to below 100 mK. The c-axis resistivity is similar, except for a sharp drop upon entry into an antiferromagnetic state at T_N 125 K. Below 10 K the resistivity follows a non-Fermi-liquid power law, rho(T) = rho_0 - AT^x with x<1, while the specific heat shows Fermi liquid behaviour with a large Sommerfeld coefficient, gamma ~ 30 mJ/mol K^2. The high temperature properties are reminiscent of those of the parent compounds of the new layered iron-pnictide superconductors, however the T -> 0 properties suggest a new class of non-Fermi liquid.

arXiv comment6 pages, 4 figures

References in corpus (15)

• Superconductivity at 38 K in the iron arsenide (Ba1-xKx)Fe2As2
• Fermi-liquid instabilities at magnetic quantum phase transitions
• An RVB phase in the triangular lattice quantum dimer model
• Superconductivity up to 37 K in (A1-xSrx)Fe2As2 with A=K and Cs
• Correlated electronic structure of LaOFeAs
• Fractionalized Fermi liquids
• Unconventional critical behaviour in a quasi-two-dimensional organic conductor
• Phenomenology of the normal state in-plane transport properties of high-$T_c$ cuprates
• Spin Freezing in Geometrically Frustrated Antiferromagnets with Weak Disorder
• Fractionalization and Fermi surface volume in heavy fermion compounds: the case of YbRh${}_2$ Si${}_2$
• Magnetic, electrical resistivity, heat-capacity and thermopower anomalies in CeCuAs2
• Metallic ground state and glassy transport in single crystalline URh${}_2$Ge${}_2$: Enhancement of disorder effects in a strongly correlated electron system
• Transport properties of moderately disordered UCu${}_4$Pd
• Singular dynamics and pseudogap formation in the underscreened Kondo impurity and Kondo lattice models
• Mottness underpins the anomalous optical response of Iron Pnictides

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• First-principles investigation of half-metallic ferromagnetism of half-Heusler compounds XYZ
• Spin-state transition in the Fe-pnictides
• Evidences of Mott physics in iron pnictides from x-ray spectroscopy
• Structural origin of the anomalous temperature dependence of the local magnetic moments in the CaFe${}_2$As${}_2$ family of materials
• Hidden spin liquid in an antiferromagnet: Applications to FeCrAs
• Coexistence of metallic and nonmetallic properties in the pyrochlore Lu${}_2$Rh${}_2$O${}_7$
• From frustrated magnetism to spontaneous Chern insulators
• Optical properties and electronic structure of the nonmetallic metal FeCrAs
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• Non-linear effect of uniaxial pressure on superconductivity in CeCoIn5
• Fluctuating magnetism of Co- and Cu-doped NaFeAs
• Enhanced Neel temperature and unusual thermal expansion in flux-grown FeCrAs crystals
• Honeycomb lattice iridate on the verge of Mott-collapse