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NMR Studies on 3He-3He and 3He-4He tunneling motions in solid 3He-4He mixtures
Authors:Yutaka Hirayoshi  Takao Mizusaki  Satoru Maegawa  Akira Hirai
Affiliation:(1) Department of Physics, Faculty of Science, Kyoto University, Kyoto, Japan
Abstract:Helium-3 nuclear spin relaxation times T 1, T 2, and T 1rhovhave been measured for 3He-4He solid mixtures at the exchange plateau region (~0.5K). The 3He concentrations X 3of the samples were 7.2, 2.9, 1.8, 1.4, 0.67, 0.65, and 0.22%, and their molar volumes varied between 19.9 and 20.9cm3/mole in hcp phase. The spectral density function J(OHgr) for dipolar field fluctuations was determined in the low-frequency branch from T 1rhovmeasurements and in the high-frequency branch from conventional T 1measurements. It was found that J(OHgr) is given by J(ohgr) = cJ(ohgr)|3–4 + (1–c)J(ohgr)|3–3, where J(OHgr)|3–4 is the spectral density function due to the 3He-4He tunneling motions, and J(OHgr)|3–3 is that due to the 3He-3He tunneling motions. Using the Torrey theory, the correlation frequency of the 3He-4He tunneling motions was evaluated from T 1rhovdata, and was found to be in good agreement with Landesman 's theory.Supported in part by the Japan Society for the Promotion of Science through a grant to Y.H.
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