Magnetotransport of multiple-band nearly-antiferromagnetic metals due to "hot-spot" scattering

Abstract

Multiple-band electronic structure and proximity to antiferromagnetic (AF) instability are the key properties of iron-based superconductors. We explore the influence of scattering by the AF spin fluctuations on transport of multiple-band metals above the magnetic transition. A salient feature of scattering on the AF fluctuations is that it is strongly enhanced at the Fermi surface locations where the nesting is perfect ("hot spots" or "hot lines"). We review derivation of the collision integral for the Boltzmann equation due to AF-fluctuations scattering. In the paramagnetic state, the enhanced scattering rate near the hot lines leads to anomalous behavior of electronic transport in magnetic field. We explore this behavior by analytically solving Boltzmann transport equation with approximate transition rates. This approach accounts for return scattering events and is more accurate than the relaxation-time approximation. The magnetic-field dependences are characterized by two very different field scales, the lower scale is set by the hot-spot width and the higher scale is set by the total scattering amplitude. A conventional magnetotransport behavior is limited to magnetic fields below the lower scale. In the wide range in between these two scales the longitudinal conductivity has linear dependence on the magnetic field and the Hall conductivity has quadratic dependence. The linear dependence of the diagonal component reflects growth of the Fermi-surface area affected by hot spots proportional to the magnetic field. We discuss applicability of this theoretical framework for describing of anomalous magnetotransport properties in different iron pnictides and selenides in the paramagnetic state.

16 pages, 7 figures, subm. Phys. Rev. B

References in corpus (10)

• Fermi-liquid instabilities at magnetic quantum phase transitions
• High-temperature superconductivity in iron-based materials
• Iron-Based Superconductors: current status of materials and pairing mechanism
• Hall effect and resistivity study of the magnetic transition, carrier content and Fermi liquid behavior in Ba(Fe(1-x) Cox)2As2
• Anomalous Transport Phenomena in Fermi Liquids with Strong Magnetic Fluctuations
• Hole and Electron Contributions to the Transport Properties of Ba(Fe_(1-x)Ru_x)_2As_2 Single Crystals
• Multiband Effect and Possible Dirac Fermions in Fe${}_{1+y}$Te${}_{0.6}$Se${}_{0.4}$
• Evidence of quantum criticality in the phase diagram of K${}_x$Sr${}_{1-x}$Fe${}_2$As${}_2$ from measurements of transport and thermoelectricity
• Breakdown of weak-field magnetotransport at a metallic quantum critical point
• Resistive anisotropy due to spin-fluctuation scattering in the nematic phase of iron pnictides

Cited by in corpus (8)

• Magnetoresistance scaling, disorder, `hot spots' and the origin of $T$-linear resistivity in BaFe${}_2$(As${}_{1-x}$P${}_x$)${}_2$
• $B^2$ to $B$-linear magnetoresistance due to impeded orbital motion
• Nernst effect of high-mobility Weyl electrons in NdAlSi enhanced by a Fermi surface nesting instability
• Unconventional localization of electrons inside of a nematic electronic phase
• Linear Magnetoresistance from Glassy Orders
• Interband scattering- and nematicity-induced quantum oscillation frequency in FeSe
• Strong correlation between $H$-linear magnetoresistance and strange metal in FeSe superconductor
• $H$-linear magnetoresistance in NbSe${}_2$ due to impeded cyclotron motion