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

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 ti 800 K to below 100 mK. The c-axis re...

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Bibliographic Details
Published in:Europhysics letters 2009-01, Vol.85 (1), p.17009-17009(6)
Main Authors: Wu, W, McCollam, A, Swainson, I, Rourke, P. M. C, Rancourt, D. G, Julian, S. R
Format: Article
Language:English
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Summary: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 ti 800 K to below 100 mK. The c-axis resistivity is similar, except for a sharp drop upon entry into an antiferromagnetic state at TN~125 K. Below 10K the resistivity follows a non-Fermi-liquid power law, p(T) = p0 - ATx with x < 1, while the specific heat shows Fermi-liquid behaviour with a large Sommerfeld coefficient, gamma ~ 30 mJ/mol K2. The high-temperature properties are reminiscent of those of the parent compounds of the new layered iron-pnictide superconductors, however the T - > 0 K properties suggest a new class of non-Fermi liquid.
ISSN:0295-5075
1286-4854
DOI:10.1209/0295-5075/85/17009