Nonlinear effects on spin waves in3He-4He dilute solutions |
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| Authors: | Hikota Akimoto Osamu Ishikawa Gong-Hun Oh Masahito Nakagawa Tohru Hata Takao Kodama |
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| Affiliation: | (1) Faculty of Science, Osaka City University, Osaka, Japan;(2) Present address: Institute for Solid State Physics, University of Tokyo, 106 Tokyo, Japan |
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| Abstract: | Spin dynamics of3He-4He dilute solution have been studied in the collisionless regime by NMR methods. In cw NMR experiments, we observed spin waves in a magnetic field gradient. The frequency difference between the first mode and the others obeyed a two-thirds power law in the strength of the field gradient. By using a pulsed NMR method, nonlinear spin dynamics were studied. We observed the large amplitude spin waves after an rf pulse. The frequency of each spin-wave mode depended on the tipping angle. By using the parameter  determined in the present experiment, the numerical calculated results based on Leggett-Rice theory are in good agreement with the results of the pulsed NMR experiments. |
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