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NMR investigation of the low-temperature dynamics of solid4He doped with3He impurities
- Source :
- Physical Review B. 87
- Publication Year :
- 2013
- Publisher :
- American Physical Society (APS), 2013.
-
Abstract
- The lattice dynamics of solid He-4 has been explored using pulsed NMR methods to study the motion of He-3 impurities in the temperature range (0.05-0.20 K) where experiments have revealed anomalies attributed to superflow or unexpected viscoelastic properties of the solid He-4 lattice. We report the results of measurements of the nuclear spin-lattice and spin-spin relaxation times that measure the fluctuation spectrum at high and low frequencies, respectively, of the He-3 motion that results from quantum tunneling in the He-4 matrix. The measurements were made for He-3 concentrations 16 < x(3) < 2000 ppm. For He-3 concentrations x(3) = 16 and 24 ppm, large changes are observed for both the spin-lattice relaxation time T-1 and the spin-spin relaxation time T-2 at temperatures close to those for which the anomalies are observed in measurements of torsional oscillator responses and the shear modulus. These changes in the NMR relaxation rates were not observed for higher He-3 concentrations.
- Subjects :
- Materials science
Condensed matter physics
Doping
Relaxation (NMR)
Analytical chemistry
Atmospheric temperature range
Condensed Matter Physics
01 natural sciences
Viscoelasticity
010305 fluids & plasmas
Electronic, Optical and Magnetic Materials
Shear modulus
Impurity
0103 physical sciences
Condensed Matter::Strongly Correlated Electrons
010306 general physics
Fluctuation spectrum
Quantum tunnelling
Subjects
Details
- ISSN :
- 1550235X and 10980121
- Volume :
- 87
- Database :
- OpenAIRE
- Journal :
- Physical Review B
- Accession number :
- edsair.doi...........334d27c7490b89033d1c293c6f8da27d