Transport anomalies and marginal-fermi-liquid effects at a quantum critical point
The conductivity and the tunneling density of states of disordered itinerant electrons in the vicinity of a ferromagnetic transition at low temperature are discussed. Critical fluctuations lead to nonanalytic frequency and temperature dependencies that are distinct from the usual long-time tail effects in a disordered Fermi liquid. The crossover between these two types of behavior is proposed as an experimental check of recent theories of the quantum ferromagnetic critical behavior. In addition, the quasiparticle properties at criticality are shown to be those of a marginal Fermi liquid.
Belitz
D
Department of Physics and Materials Science Institute, University of Oregon, Eugene, Oregon 97403, USA.
Kirkpatrick
TR
Narayanan
R
Vojta
T