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29 March 2024
 
  » arxiv » 1010.2876

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Intrinsic scattering in pnictides: transport properties of LiFeAs single crystals
O. Heyer ; T. Lorenz ; V.B. Zabolotnyy ; D.V. Evtushinsky ; S.V. Borisenko ; I. Morozov ; L. Harnagea ; S. Wurmehl ; C. Hess ; B. Buechner ;
Date 14 Oct 2010
AbstractLiFeAs is unique among the broad family of FeAs-based superconductors, because it is the only stoichiometric compound that is superconducting under ambient conditions. We studied the electrical transport on a high-quality single crystal. The resistivity shows quadratic temperature dependence at low temperature giving evidence for strong electron-electron scattering and a tendency towards saturation around room temperature. The Hall constant is negative and changes with temperature, what most probably arises from a van Hove singularity close to the Fermi energy in one of the hole-like bands. From the anisotropic magnetic-field dependence of $T_c$ we extrapolate the correlation lengths $xi_i$ and derive a moderate anisotropy $xi_a/xi_c simeq 2.2$
Source arXiv, 1010.2876
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