Absence of a Quadratic Term in the He4 Excitation Spectrum

Pat R. Roach, B. M. Abraham, J. B. Ketterson, and M. Kuchnir
Phys. Rev. Lett. 29, 32 – Published 3 July 1972
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Abstract

By directly measuring the difference in velocity of 30 and 90 MHz sound waves in liquid He4 below 100 mK, we have determined that the elementary excitation spectrum cannot be described by an expression ε(k)=ck(1+α1k+α2k2+) which has a value for α1 that is greater than 0.01 Å.

  • Received 25 May 1972

DOI:https://doi.org/10.1103/PhysRevLett.29.32

©1972 American Physical Society

Authors & Affiliations

Pat R. Roach, B. M. Abraham, J. B. Ketterson, and M. Kuchnir

  • Argonne National Laboratory, Argonne, Illinois 60439

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Issue

Vol. 29, Iss. 1 — 3 July 1972

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