TY - JOUR
T1 - Observation of a second-sound-like mode in superfluid-filled aerogel
AU - McKenna, M. J.
AU - Slawecki, Tania Maria
AU - Maynard, J. D.
PY - 1991/1/1
Y1 - 1991/1/1
N2 - Superfluid He4 is interesting acoustically because it can support more than one mode of sound propagation, and these can be used to study critical properties. Recently, there has been interest in superfluid-filled aerogels, but for such compressible materials one does not observe the ordinary (fourth) sound; instead there is a mode intermediate between first and fourth sound and a second-sound-like mode. We present a theory for the modes and the first observation of the aerogel second-sound-like mode, which is important because it propagates near the critical temperature.
AB - Superfluid He4 is interesting acoustically because it can support more than one mode of sound propagation, and these can be used to study critical properties. Recently, there has been interest in superfluid-filled aerogels, but for such compressible materials one does not observe the ordinary (fourth) sound; instead there is a mode intermediate between first and fourth sound and a second-sound-like mode. We present a theory for the modes and the first observation of the aerogel second-sound-like mode, which is important because it propagates near the critical temperature.
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U2 - 10.1103/PhysRevLett.66.1878
DO - 10.1103/PhysRevLett.66.1878
M3 - Article
C2 - 10043333
AN - SCOPUS:3643119816
VL - 66
SP - 1878
EP - 1881
JO - Physical Review Letters
JF - Physical Review Letters
SN - 0031-9007
IS - 14
ER -