Magnetotransport in La(Fe,Ru)AsO as a probe of band structure and mobility

Abstract

In this work we investigate the Ru substituted LaFeAsO compound, by studying the magnetotransport behaviour and its relationship with the band structure, in different regimes of temperature, magnetic field and Ru content. In particular we analyse the magnetoresistance of LaFe1-xRuxAsO (0 <= x <= 0.6) samples with the support of ab initio calculations and we find out that in the whole series: (i) the transport is dominated by electron bands only; (ii) the magnetoresistance exhibits distinctive features related to the presence of Dirac cones; indeed, ab initio calculations confirm the presence of anisotropic Dirac cones in the band structure; (iii) the low temperature mobility is exceptionally high and reaches 18.6 m2/(Vs) in the Ru-free sample at T=2K, in the extreme limit of a single Landau level occupied in the Dirac cones; (iv) the mobility drops abruptly above 10K-15K; (v) the disorder has a very weak effect on the band mobilities and on the transport properties; (vi) there exists a correlation between the temperature ranges of Dirac cones and SDW carrier condensation. These findings may be of crucial importance in the investigation of the pairing mechanism in the F-doped superconducting La(Fe,Ru)As(O,F) compounds related to this series of parent compounds.

18 pages, 12 figures, 1 table

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• Correlated trends of coexisting magnetism and superconductivity in optimally electron-doped oxy-pnictides
• Unconventional Hall effect in pnictides from interband interactions
• Thermoelectric properties of iron-based superconductors and parent compounds
• Magnetic-field induced resistivity minimum with in-plane linear magnetoresistance of the Fermi liquid in SrTiO3-x single crystals
• Fermi surface with Dirac fermions in CaFeAsF determined via quantum oscillation measurements
• Magnetic properties of spin diluted iron pnictides from muSR and NMR in LaFe1-xRuxAsO
• Effect of Ru susbstitution on atomic displacements in the layered SmFe_{1-x}Ru_xAsO_{0.85}F_{0.15} superconductor
• Large linear magnetoresistance and magnetothermopower in layered SrZnSb${}_2$
• Role of Dirac cones in magnetotransport properties of REFeAsO (RE=rare earth) oxypnictides
• Structural and physical properties of layered oxy-arsenides LnRuAsO (Ln = La, Nd, Sm, Gd)
• Large low-temperature magnetoresistance in SrFe2As2 single crystals
• Suppression of backward scattering of Dirac fermions in iron pnictides Ba(Fe${}_{1-x}$Ru${}_x$As)${}_2$
• Structural properties and phase diagram of the $La(F{e}_{1-x}R{u}_x)AsO$ system
• Bulk and surface Dirac states accompanied by two superconducting domes in FeSe-based superconductors
• The Electronic and Magnetic Properties of Magnetoresistant Nd1-xSrxMnAsO Oxyarsenides
• Magneto-Transport Properties of Single Crystalline LaFeAsO
• Competing magnetic phases and field-induced dynamics in DyRuAsO
• Magnetotransport studies of optimally doped Sr(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$