Nonasymptotic critical dynamics of the asymmetric-spin model in two-loop order
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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 amplitudeRλeff of the thermal conductivity.
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