Transport Anomalies and Marginal-Fermi-Liquid Effects at a Quantum Critical Point

D. Belitz; T. R. Kirkpatrick; R. Narayanan; Thomas Vojta

doi:10.1103/PhysRevLett.85.4602

Transport Anomalies and Marginal-Fermi-Liquid Effects at a Quantum Critical Point

D. Belitz, T. R. Kirkpatrick, R. Narayanan, and Thomas Vojta

Phys. Rev. Lett. 85, 4602 – Published 20 November 2000

Abstract

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.

Received 1 September 2000

DOI:https://doi.org/10.1103/PhysRevLett.85.4602

Authors & Affiliations

D. Belitz¹, T. R. Kirkpatrick², R. Narayanan³, and Thomas Vojta⁴

¹Department of Physics and Materials Science Institute, University of Oregon, Eugene, Oregon 97403
²Institute for Physical Science and Technology and Department of Physics, University of Maryland, College Park, Maryland 20742
³Theoretical Physics, University of Oxford, Oxford OX3 1NP, United Kingdom
⁴Institut für Physik, TU Chemnitz, D-09107 Chemnitz, Germany