A novel nonFermi-liquid state in the iron-pnictide FeCrAs

W. Wu; A. McCollam; I. Swainson; P. M. C. Rourke; D. G. Rancourt; S. R. Julian

doi:10.1209/0295-5075/85/17009

All issues

Volume 85 / No 1 (January 2009)

EPL, 85 1 (2009) 17009

Abstract

Issue		EPL Volume 85, Number 1, January 2009


Article Number		17009
Number of page(s)		6
Section		Condensed Matter: Electronic Structure, Electrical, Magnetic and Optical Properties
DOI		https://doi.org/10.1209/0295-5075/85/17009
Published online		19 January 2009

EPL, 85 (2009) 17009

A novel non $\hbox{--}$ Fermi-liquid state in the iron-pnictide FeCrAs

W. Wu¹, A. McCollam¹, I. Swainson², P. M. C. Rourke¹, D. G. Rancourt³ and S. R. Julian¹

¹ Department of Physics, University of Toronto - 60 St. George Street, Toronto, Ontario, Canada M5S 1A7
² Canadian Neutron Beam Centre, National Research Council Canada - Building 459, Chalk River Laboratories, Chalk River, Ontario, Canada K0J IJ0
³ Department of Physics, University of Ottawa - Ottawa, Ontario, Canada K1N 6N5

Corresponding author: sjulian@physics.utoronto.ca

Received: 3 November 2008
Accepted: 7 December 2008

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 $\hbox{--}$ 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, γ ~ 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 $\rightarrow$ 0 K properties suggest a new class of non-Fermi liquid.

PACS: 71.10.Hf – Non-Fermi-liquid ground states, electron phase diagrams and phase tansitions in model systems / 72.15.Qm – Scattering mechanisms and Kondo effect / 72.80.Ga – Transition-metal compounds

© EPLA, 2009

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