Theory of Sound Absorption in the Superfluid Phases of 3He
After the discovery of the superfluid phases of 3He,1 the propagation of zero sound was among the first properties to be studied experimentally.2,3 Somewhat unexpectedly, the sound attenuation at frequencies exceeding about 5 MHz was observed to develop a rather narrow peak just below the normal-superfluid transition, growing rapidly as the frequency was increased. It was soon realized by several authors4,5,6 that the sound absorption peak could be understood in the framework of BCS-theory (as applied7 to the new phases of 3He) as being caused by excitations of the pair condensate.
KeywordsCollective Mode Sound Absorption Axial State Sound Attenuation Superfluid Phasis
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- (4).P. Wölfle, Phys. Rev. Lett. 30, 1169 (1973); J. W. Serene, Ph.D. thesis, Cornell University 1974 (unpublished).Google Scholar
- (5).B. R. Patton, UCSD preprint 1973.Google Scholar
- (8).Units are chosen such that = kg = 1.Google Scholar
- (8a).These names were suggested to me by W. M. Saslow, while watching sea gulls on the beach.Google Scholar
- (8b).The so-called “pair breaking cusp” at T (=2(T)), sometimes referred to in the literature, is an artifact of an imprecise numerical evaluation of the expression for the sound attenuation. is a smooth function of temperature at T (J. W. Serene, private communication).Google Scholar
- (10).Pat R. Roach, B. M. Abraham, P. D. Roach, and J. B. Ketterson, to be published, and these proceedings.Google Scholar
- (13).P. Wölfle, to be published.Google Scholar
- (15).P. Wölfle, to be published.Google Scholar
- (16).Pat R. Roach, B. M. Abraham, M. Kuchnir and J. B. Ketterson, to be published and these proceedings.Google Scholar
- (18).R. Lautkaski and P. Wölfle, unpublished.Google Scholar