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Anomalous temperature dependence ofD andT 2 for dilute solutions of3He in solid4He

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Abstract

Results of measurements of the spin diffusion coefficientD and NMR relaxation timesT 1,T 2, and T1p are presented for a range of fractional3He concentrations 1 × 10−4≤x 3≤2.5 × 10−3 in solid4He at molar volumes 19.85≤V m≤21.0 cm3 and temperatures 0.4<T<2 K in both hcp and bcc phases. We observe a minimumD(T) atx 3=5×10−4, which is interpreted in terms of a transition from coherent impuriton motion to thermally activated diffusion. ForT<0.8 K, ∂(lnD)/∂(lnV m)=60±8. TheT 2 measurements show a minimum as a function of temperature forx 3≤10−3. TheT 2 (T) andT 1 (T) results yield values for activation energy and tunneling frequency of vacancies in these dilute solutions. Forx 3=5×10−4 andT ∼ 0.5 K,T 2 (V m) is anomalous.T 1ρ measurements at the same concentration indicate there is an important contribution to the spectral density of dipole field fluctuations in the kHz region.

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Author notes

  1. A. R. Allen

    Present address: Department of Applied Sciences, Norwich City College of Further and Higher Education, Norwich, England

  2. J. Schratter

    Present address: Okanagan College, Vernon, British Columbia, Canada

Authors and Affiliations

  1. School of Mathematical and Physical Sciences, University of Sussex, Brighton, England

    A. R. Allen, M. G. Richards & J. Schratter

Authors
  1. A. R. Allen
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  2. M. G. Richards
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  3. J. Schratter
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Additional information

Financial support provided for apparatus, materials, and a research studentship (ARA) by the Science Research Council.

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Allen, A.R., Richards, M.G. & Schratter, J. Anomalous temperature dependence ofD andT 2 for dilute solutions of3He in solid4He. J Low Temp Phys 47, 289–320 (1982). https://doi.org/10.1007/BF00683732

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  • DOI: https://doi.org/10.1007/BF00683732

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