Phys. Rev. B 72, 180402(R) (2005) [4 pages]

Nonanalytic corrections to Fermi-liquid behavior in helimagnets

Abstract

References

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T. R. Kirkpatrick^1,2 and D. Belitz^1,3
¹Kavli Institute for Theoretical Physics, University of California, Santa Barbara, California 93106, USA
²Institute for Physical Science and Technology and Department of Physics, University of Maryland, College Park, Maryland 20742, USA
³Department of Physics and Materials Science Institute, University of Oregon, Eugene, Oregon 97403, USA

Received 30 June 2005; published 14 November 2005

The Goldstone mode in the ordered phase of itinerant helimagnets, such as MnSi or FeGe, is determined and shown to have a strongly anisotropic dispersion relation. The softness of this mode is, in a well-defined sense, in between that of ferromagnetic and antiferromagnetic magnons, respectively. It is shown that this soft mode leads to nonanalytic corrections to Fermi-liquid behavior, with a T contribution to the specific heat coefficient, and a T ^5∕2 contribution to the resistivity. The quasiparticle inelastic lifetime shows anisotropic behavior in momentum space.

URL:

http://link.aps.org/doi/10.1103/PhysRevB.72.180402

DOI:

10.1103/PhysRevB.72.180402

PACS:

75.30.Ds, 75.25.+z

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Phys. Rev. B 72, 180402(R) (2005) [4 pages]

Nonanalytic corrections to Fermi-liquid behavior in helimagnets