TY - JOUR
T1 - Observation of dispersion in the J=2+ collective modes of B3 by nonlinear acoustic spectroscopy
AU - Manninen, A. J.
AU - Alles, H.
AU - Babkin, A. V.
AU - Pekola, J.P.
AU - McKenzie, R. H.
PY - 1992
Y1 - 1992
N2 - Parametric excitation yields new results, which cannot be obtained by conventional linear spectroscopy, on the collective modes in superfluid B3. In our ultrasonic experiments, performed in a chamber with four quartz crystals, we have excited the real squashing (J=2+) modes by two simultaneous sound waves which are mutually either parallel, orthogonal, or antiparallel. Qualitatively these results are in agreement with the theoretical dispersion relation of the J=2+ modes, and quantitatively we have been able to extract the collective-mode velocities from the line splittings in zero magnetic field.
AB - Parametric excitation yields new results, which cannot be obtained by conventional linear spectroscopy, on the collective modes in superfluid B3. In our ultrasonic experiments, performed in a chamber with four quartz crystals, we have excited the real squashing (J=2+) modes by two simultaneous sound waves which are mutually either parallel, orthogonal, or antiparallel. Qualitatively these results are in agreement with the theoretical dispersion relation of the J=2+ modes, and quantitatively we have been able to extract the collective-mode velocities from the line splittings in zero magnetic field.
UR - http://www.scopus.com/inward/record.url?scp=11944269709&partnerID=8YFLogxK
U2 - 10.1103/PhysRevLett.68.3725
DO - 10.1103/PhysRevLett.68.3725
M3 - Article
AN - SCOPUS:11944269709
SN - 0031-9007
VL - 68
SP - 3725
EP - 3728
JO - Physical Review Letters
JF - Physical Review Letters
IS - 25
ER -