Abstract
Nuclear magnetic relaxation studies of isotopically impure solid4He have been made in the temperature-independent region of the relaxation spectrum, below 0.7 K. The Torrey theory for nuclear relaxation has been applied to measurements ofT 1 andT 2 to calculate the characteristic fluctuation time of the3He atoms due to the zero-point motion of3He and4He atoms. The fluctuation rates have been determined as a function of molar volume and Larmor frequency in samples where the mole fractions of3He in the gaseous mixtures used to form the solids were 0.02, 0.01, 0.005, and 0.002. The volume dependence of the fluctuation rate has been found to be far greater than that of the exchange rate of a3He-3He pair.T 1 has been found to vary as ω 20 , and bothT 1 andT 2 increased as the concentration decreased, in agreement with the Torrey theory. Preliminary investigations of the solid isotopic phase separation have also been carried out.
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Research supported in part by the National Science Foundation through Grant No. GP-29682 and the Advanced Research Projects Agency through the Materials Science Center at Cornell University, MSC Report # 1675.
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Greenberg, A.S., Thomlinson, W.C. & Richardson, R.C. Nuclear magnetic resonance studies of isotopic impurity tunneling in solid hcp4He. J Low Temp Phys 8, 3–28 (1972). https://doi.org/10.1007/BF00655545
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DOI: https://doi.org/10.1007/BF00655545