A novel non-Fermi-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

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

Strongly Correlated Electrons 2009-11-13 v1

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

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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.

Keywords

non-Fermi-liquid iron-pnictide FeCrAs transport properties thermodynamic properties antiferromagnetic state

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@article{arxiv.0811.3439,
  title  = {A novel non-Fermi-liquid state in the iron-pnictide FeCrAs},
  author = {W. Wu and A. McCollam and I. Swainson and P. M. C. Rourke and D. G. Rancourt and S. R. Julian},
  journal= {arXiv preprint arXiv:0811.3439},
  year   = {2009}
}

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6 pages, 4 figures

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

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