F. Rullier-Albenque, D. Colson, A. Forget, H. Alloul
Resistivity, Hall effect and transverse magnetoresistance (MR) have been measured in low residual resistivity single crystals of LiFeAs. Comparison with ARPES and Quantum oscillation data implies that four carrier bands unevenly contribute to the transport. However the scattering rates of the carriers all display the T^2 behavior expected for a Fermi liquid. Near Tc low field deviations of the MR with respect to a H^2 variation permit us to extract the superconducting fluctuation (SCF) contribution to the conductivity. Though below Tc the anisotropy of superconductivity is rather small, the SCF display a quasi ideal two-dimensional behavior which persists up to 2.5 Tc. These results call for a refined theoretical understanding of the multiband behavior of superconductivity in this pnictide.
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http://arxiv.org/abs/1206.2278
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