Observation Of Dispersion In The J=2+ Collective Modes Of He-3-B By Nonlinear Acoustic Spectroscopy
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| Title | Observation Of Dispersion In The J=2+ Collective Modes Of He-3-B By Nonlinear Acoustic Spectroscopy |
| Publication Type | Journal Article |
| Year of Publication | 1992 |
| Authors | Manninen, A. J., Alles H., Babkin A. V., Pekola J. P., and McKenzie Ross H. |
| Journal | Physical Review Letters |
| Volume | 68 |
| Issue | 25 |
| Pagination | 3725–3728 |
| Abstract | Parametric excitation yields new results, which cannot be obtained by conventional linear spectroscopy, on the collective modes in superfluid He-3-B. 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. |