Zeitschrift für Physik B Condensed Matter

, Volume 45, Issue 2, pp 129–135 | Cite as

Nonasymptotic critical dynamics of the asymmetric-spin model in two-loop order

  • V. Dohm
  • R. Folk
Article

Abstract

The crossover behaviour in the dynamics near the Lambda transition of4He is analyzed on the basis of the complete renormalization-group flow equations for the asymmetric-spin model (F) in two-loop order. Our results confirm the conclusions and refine the results obtained from an earlier analysis based on the symmetric model (E) and invalidate part of a recent analysis treating model F in an unsystematic approximation. Excellent agreement is found with measurements of second-sound damping over four decades in relative temperature. Closer toTλ our analysis predicts a further increase of the effective amplitudeR λ eff of the thermal conductivity.

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Copyright information

© Springer-Verlag 1981

Authors and Affiliations

  • V. Dohm
    • 1
  • R. Folk
    • 1
    • 2
  1. 1.Institut für FestkörperforschungKFA JülichJülich 1Germany
  2. 2.Institut für Theoretische PhysikUniversität LinzLinzAustria

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