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 spindensity 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:

Physical Review B
 Pub Date:
 April 2004
 DOI:
 10.1103/PhysRevB.69.144423
 arXiv:
 arXiv:condmat/0312168
 Bibcode:
 2004PhRvB..69n4423B
 Keywords:

 75.10.Lp;
 72.15.Eb;
 71.10.Hf;
 71.18.+y;
 Band and itinerant models;
 Electrical and thermal conduction in crystalline metals and alloys;
 NonFermiliquid ground states electron phase diagrams and phase transitions in model systems;
 Fermi surface: calculations and measurements;
 effective mass g factor;
 Condensed Matter  Materials Science;
 Condensed Matter  Strongly Correlated Electrons
 EPrint:
 11 pages revtex, 4 figures