Group-velocity spectroscopy of collective modes in superfluid He3-B

I. D. Calder*, D. B. Mast, Bimal K. Sarma, J. R. Owers-Bradley, John B Ketterson, William P Halperin

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


The group velocity of high-frequency sound for TTc, and the group velocity and attenuation of sound at higher temperatures, have been measured and analyzed to give the frequencies and coupling strengths of two order-parameter collective modes in He3-B. For the squashing mode at 13.1 bars and T→0, ωsqΔBCS=1.501 and the coupling constant λsq=0.010±0.001. The recently discovered collective mode at ωνΔBCS=1.075 (T→0) has a coupling constant determined from the group velocity to be λν=5.8×10-6.

Original languageEnglish (US)
Pages (from-to)1866-1869
Number of pages4
JournalPhysical review letters
Issue number23
StatePublished - Jan 1 1980

ASJC Scopus subject areas

  • Physics and Astronomy(all)


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