Magnetotransport in nearly antiferromagnetic metals

A. Rosch
Phys. Rev. B 62, 4945 – Published 15 August 2000
PDFExport Citation

Abstract

We present a theory of the magnetotransport in weakly disordered metals close to an antiferromagnetic quantum-critical point. The anisotropic scattering from critical spin fluctuations is strongly influenced by weak but isotropic scattering from small amounts of disorder. This leads to a large regime where the resistivity obeys a scaling form ρ=ρ0+Δρρ0+T3/2f[T/ρ0,(ppc)/ρ0,B/ρ03/2], where ρ0 is the residual resistivity, B the magnetic field, and ppc>0 measures the distance from the quantum-critical point on the paramagnetic side of the phase diagram. Orbital effects of the magnetic field are most pronounced in very clean samples for not too low temperatures, where the resistivity for increasing magnetic field crosses over from a linear temperature dependence ΔρTρ0 to a resistivity linear in B and independent of T and ρ0. At higher magnetic fields, Δρ saturates at a value proportional to T1.5 or T2/(ppc). Deviations from scaling, the interplay of orbital and spin contributions of the magnetic field, and experimental test of the spin-fluctuation model are discussed in detail.

  • Received 27 October 1999

DOI:https://doi.org/10.1103/PhysRevB.62.4945

©2000 American Physical Society

Authors & Affiliations

A. Rosch

  • Center for Materials Theory, Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08854

References (Subscription Required)

Click to Expand
Issue

Vol. 62, Iss. 8 — 15 August 2000

Reuse & Permissions
Access Options

Authorization Required


×
×

Images

×

Sign up to receive regular email alerts from Physical Review B

Log In

Cancel
×

Search


Article Lookup

Paste a citation or DOI

Enter a citation
×