Critical-Region Second-Sound Velocity in He II

J. A. Tyson; D. H. Douglass, Jr

doi:10.1103/PhysRevLett.21.1308

Critical-Region Second-Sound Velocity in He II

J. A. Tyson and D. H. Douglass, Jr.

Phys. Rev. Lett. 21, 1308 – Published 28 October 1968

Abstract

We present data for the velocity and dispersion of second sound in the critical region of He II. To good accuracy, the critical-region expressions relating $u_{2}$ , $ρ_{s}$ , and $C_{p}$ are shown to be self-consistent. The anomalous dispersion is consistent with recent estimates of the coherence length.

Received 15 July 1968

DOI:https://doi.org/10.1103/PhysRevLett.21.1308

Authors & Affiliations

J. A. Tyson^* and D. H. Douglass, Jr.^†

Department of Physics and The James Franck Institute, The University of Chicago, Chicago, Illinois

^*National Research Council-U. S. Air Force Office at Scientific Research Postdoctoral Fellow.
^†A. P. Sloan Fellow. Now at Department of Physics, University of Rochester, Rochester, N. Y.