Simultaneous Measurement of Torsional Oscillator and NMR of Very Dilute 3He in Solid 4He

Abstract

We have investigated the NMR properties of dilute 3He impurities in solid 4He contained in a torsional oscillator (TO) by the simultaneous measurement of the NMR and the torsional oscillator response of the so-called supersolid 4He. From measurements on samples with one hundred to a few hundred ppm of 3He, we have found three different states of 3He. The first is the homogeneously distributed isolated 3He atom in a solid matrix of 4He. The second is the 3He cluster in a homogeneous 4He matrix, which appears below the phase separation temperature of a solid mixture. The third is the 3He cluster in some nonuniform part of a 4He crystal. We find that 3He atoms contained in the third component remain in a nearby location even above the phase separation temperature. Based on the fact that even a ppm of 3He affects the supersolid response in a TO below and above the phase separation temperature, we propose that the nonuniform part of a crystal that holds the third type of 3He and thus has a higher local concentration of 3He plays an important role in the supersolid phenomenon in a TO.

5 pages, 5 figures, Accepted for publication in Physical Review B

References in corpus (5)

• Oscillation Frequency Dependence of Non-Classical Rotation Inertia of Solid ${}^4$He
• Observation of non-classical rotational inertia in bulk solid 4He
• Annealing Effect for Supersolid Fraction in ${}^4$He
• The effect of 3He impurities on the nonclassical response to oscillation of solid 4He
• Solid 4He and the Supersolid Phase: from Theoretical Speculation to the Discovery of a New State of Matter? A Review of the Past and Present Status of Research

Cited by in corpus (7)

• Absence of supersolidity in solid helium in porous Vycor glass
• Upper limit of supersoldity in solid helium
• NMR study of the dynamics of 3He impurities in the proposed supersolid state of solid 4He
• Effects of ${}^3$He Impurity on Solid ${}^4$He Studied by Compound Torsional Oscillator
• NMR Investigation of the Low Temperature Dynamics of solid 4He doped with 3He impurities
• NMR Study of Disordered Inclusions in the Quenched Solid Helium
• Saga of Superfluid Solids