3He impurity excitations in solid4He

Grigoriev, V. N.; Esel'son, B.N.; Mikheev, V. A.; Slusarev, V. A.; Strzhemechny, M. A.; Shulman, Yu. E.

doi:10.1007/bf00654398

Cited by 43 publications

(28 citation statements)

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“…The studies were carried out for a Larmor frequency of ω L /2π = 2 MHz as the expected relaxation times extrapolated from previous studies [13][14][15][16] would be prohibitively long at higher frequencies. In order to determine the 3 He concentrations of the samples we measured the amplitude of the NMR echoes at high temperatures (150 < T < 350 mK) which follows the Curie law and compared the signal to a standard reference sample with x 3 = 1000 ppm.…”

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confidence: 99%

“…The nuclear spin dynamics of 3 He impurities in solid 4 He have been studied extensively for relatively high concentrations (x 3 > 90 ppm) and high temperatures (T > 350 mK) [13][14][15][16]. The results have been described in terms of mobile 3 He impurities tunneling through the 4 He matrix by 3 He- 4 He exchange (J 34 ) with a mutual scattering due to the elastic deformation field surrounding each impurity (K(r) = K 0 r −3 ) [10,21].…”

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confidence: 99%

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NMR Study of the Dynamics ofHe3Impurities in the Proposed Supersolid State of SolidHe4

Huan

Yin

et al. 2011

Phys. Rev. Lett.

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confidence: 99%

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confidence: 99%

NMR Study of the Dynamics ofHe3Impurities in the Proposed Supersolid State of SolidHe4

Huan

Yin

et al. 2011

Phys. Rev. Lett.

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“…Eq. (23) shows that the effective cross-section in the gas approximation (noninteracting quasiparticles) considered is inversely proportional to the band width ∆. The same dependence on ∆ follows also from the theories of Landesman [26] and Yamashita [27] for interacting quasiparticles.…”

Section: Defecton-defecton Scatteringmentioning

confidence: 54%

“…It became clear that additional information is necessary and that it could be obtained from the temperature dependence (12). An increasing diffusion with decreasing temperature was first observed by the Kharkov group [22,23] in 1973. Surprisingly, the treatment of the experimental data using the theory of Andreev and Lifshitz [12] gave for the exchange integral A a value of the same order of magnitude as that obtained in [21].…”

Section: Historical Reviewmentioning

confidence: 99%

Quantum diffusion

Pushkarov

2004

Open Physics

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Basic ideas and results which characterize quantum diffusion of defects in quantum crystals like solid helium as a new phenomenon are presented. Quantum effects in such media lead to a delocalization of point defects (vacancies, impurities etc.) and they turn into quasiparticles of a new type -defectons, which are characterized not by their position in the crystal lattice but by their quasimomentum and dispersion law. Defectondefecton and defecton-phonon scattering are considered and an interpolation formula for the diffusion coefficient valid in all interesting temperature and concentration regions is presented. A comparison with the experimental data is made. Some alternative points of view are discussed in detail and the inconsistency of the Kisvarsanyi-Sullivan theory is shown.

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“…Since the general picture resembles very much corresponding curves for the quantum diffusion coefficient of 3 He impurities in solid 4 He in the regime of ultimately low 3 He fractions [27,28] (see also Fig. 14), we recapitulate the main points of this phenomenon and corresponding considerations.…”

Section: Diffusion Of Light-mass Particles In C 60mentioning

confidence: 86%

Novel carbon materials: New tunneling systems (Review Article)

Strzhemechny

Долбин

2013

Low Temperature Physics

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This review covers recent achievements in the studies of quantum properties of the novel carbon materials (fullerite C 60 and bundles of single-walled nanotubes (SWNT)) saturated with such light-mass species as helium isotopes, the homonuclear molecular hydrogens, and neon. It is shown that even some heavy dopants demonstrate kinetic phenomena, in which coherent effects play an essential role. Two theoretical concepts are surveyed which have been suggested for the explanation of the anomalous phenomena in saturation kinetics and linear thermal expansion of doped C 60 . Most unusual effects have been also observed in the low-temperature radial expansion of bundles of single-walled carbon nanotubes saturated with the helium isotopes. First, it was shown that low-temperature radial expansion of pure SWNT is negative, i.e., a nanotube shrinks with warming. Second, saturation of SWNT bundles with the helium isotopes entails a huge increase of the negative expansion effect, when the dopant is He. So far, no detailed physical picture has been put forward. It is worth mentioning that the dynamics of a single helium atom on an isolated nanotube corresponds to that of a tight-bound quasiparticle with a band width of about 10 K.

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3He impurity excitations in solid4He

Cited by 43 publications

References 10 publications

NMR Study of the Dynamics ofHe3Impurities in the Proposed Supersolid State of SolidHe4

NMR Study of the Dynamics ofHe3Impurities in the Proposed Supersolid State of SolidHe4

Quantum diffusion

Novel carbon materials: New tunneling systems (Review Article)

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