Magnetotransport near a quantum critical point in a simple metal
Abstract
We use geometric considerations to study transport properties, such as the conductivity and Hall coefficient, near the onset of a nestingdriven spin density wave in a simple metal. In particular, motivated by recent experiments on vanadiumdoped chromium, we study the variation of transport coefficients with the onset of magnetism within a meanfield treatment of a model that contains nearly nested electron and hole Fermi surfaces. We show that most transport coefficients display a leading dependence that is linear in the energy gap. The coefficient of the linear term, though, can be small. In particular, we find that the Hall conductivity σ_xy is essentially unchanged, due to electronhole compensation, as the system goes through the quantum critical point. This conclusion extends a similar observation we made earlier for the case of completely flat Fermi surfaces to the immediate vicinity of the quantum critical point where nesting is present but not perfect.
 Publication:

APS March Meeting Abstracts
 Pub Date:
 March 2004
 Bibcode:
 2004APS..MARV25015B