Multiorbital effects on the transport and the superconducting fluctuations in LiFeAs

Abstract

The resistivity, Hall effect and transverse magnetoresistance (MR) have been measured in low residual resistivity single crystals of LiFeAs. A comparison with angle resolved photoemission spectroscopy 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 contribution to the conductivity. Though below Tc the anisotropy of superconductivity is rather small, the superconducting fluctuations display a quasi ideal two-dimensional behavior which persists up to 1.4 Tc. These results call for a refined theoretical understanding of the multiband behavior of superconductivity in this pnictide.

8pages with supplementary material, 6 figures

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• Electronic transport properties and hydrostatic pressure effect of FeSe${}_{0.67}$Te${}_{0.33}$ single crystals free of phase separation
• Anomalous superconducting state in LiFeAs implied by the ${}^{75}$As Knight shift measurement
• Measurements of the fluctuation-induced in-plane magnetoconductivity at high reduced temperatures and magnetic fields in the iron arsenide BaFe(2-x)NixAs2
• Quasi-2D behavior of 112-type iron-based superconductors
• Fluctuations in two-band superconductors in a strong magnetic field
• The Three-Dimensional Electronic Structure of LiFeAs: Strong-coupling Superconductivity and Topology in the Iron Pnictides
• Optical Conductivity Evidence of Clean-Limit Superconductivity in LiFeAs
• Magnetotransport studies of Superconducting Pr${}_4$Fe${}_2$As${}_2$Te${}_{1-x}$O${}_4$
• Novel polymorphic phase of BaCu2As2: impact of flux for new phase formation in crystal growth
• Anisotropy of the superconducting fluctuations in multiband superconductors: the case of LiFeAs
• Large increase of the anisotropy factor in the overdoped region of Ba(Fe${}_{1-x}$Ni${}_x$)${}_2$As${}_2$ as probed by fluctuation spectroscopy
• Absence of nematic instability in LiFeAs
• Cuprates, Pnictides and Sulfosalts: Lessons in Functional Materials