NMR Study of Superfluid Phases of 3He Confined in 97.5% Porous Silica Aerogel |
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Authors: | Hisashi Nakagawa Ken Obara Hideo Yano Osamu Ishikawa Tohru Hata |
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Affiliation: | 1. Graduate School of Science, Osaka City University, Osaka, 558-8585, Japan
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Abstract: | We have studied the scattering effect from aerogel strands on superfluid phases of 3He by a cw NMR method at 920 kHz. Liquid 3He at a pressure of 13 bar was confined in 97.5% porous aerogel from the same batch as that of a recent 4th sound study. The NMR experiment was performed in a magnetic field of 28.4 mT down to 0.3 mK. As temperature decreased, the NMR resonant frequency increased below 0.76 mK. The temperature of 0.76 mK agrees with the superfluid transition temperature T aerogel c observed in the 4th sound study at the same pressure. Below T aerogel c the behavior of thefrequency shift as a function of temperature indicates that there is no phasetransition to the other superfluid phase down to about 0.4 T aerogel c . Owing to a very large surface solid 3He magnetization, we could not determine the superfluid phase of 3He in the aerogel in the magnetization measurement. |
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