Nucleation of crystals at the bcc-hcp transition line in solid<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow /><mml:mrow><mml:mn>4</mml:mn></mml:mrow></mml:msup></mml:mrow><mml:mi mathvariant="normal">He</mml:mi></mml:math>

Maekawa, M.; Okumura, Y.; Okuda, Y.

doi:10.1103/physrevb.65.144525

Cited by 20 publications

(11 citation statements)

References 18 publications

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“…Here the tangle of dendrites is very dense and there must be liquid regions inside the tangle, so that light is strongly scattered and the solid appears dark. Such dark helium samples have already been observed by Maekawa et al [52] and by Ford et al [53]. It is possible that the samples of Rittner and Reppy showing large NCRIF [9] are a dense tangle of dendrites since they have been solidified by a rapid temperature quench of the normal liquid as in the case of Fig.…”

Section: Crystals Grown By Fast Injectionsupporting

confidence: 59%

Optical Observations of Disorder in Solid Helium 4

2008

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It has been proposed that the supersolidity of helium 4 is associated with disorder in the solid samples. We report optical observations of this disorder in samples grown by different methods. We show that, when grown by the "blocked capillary method" as in most experiments showing anomalous phenomena, solid helium 4 can be polycrystalline with grain sizes down to the micrometer range, much smaller than the 0.1 mm found in some other experiments.We analyze the properties of grain boundaries, and in particular the existence of liquid channels at the contact of grain boundaries with walls. Our analysis includes measurements of the contact angle of the liquid-solid interface with these walls, which exhibits a large hysteresis. Furthermore, we predict that similar channels should exist at the junction between grain boundaries.

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Section: Crystals Grown By Fast Injectionsupporting

confidence: 59%

Optical Observations of Disorder in Solid Helium 4

2008

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“…The figure is constructed from a series of frequency sweeps made whilst warming through the hcp-bcc phase transition. The transition is seen at around 1.44 K, slightly lower than the expected transition temperature of 1.46 K [25]. The discrepancy is most likely due to a small temperature gradient between the cell and the thermometer on the mixing chamber of the refrigerator.…”

Section: Measurements Around the Bcc-hcp Phase Transitionmentioning

confidence: 87%

Response of a Mechanical Oscillator in Solid 4He

et al. 2013

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We present the first measurements of the response of a mechanical oscillator in solid 4 He. We use a lithium niobate tuning fork operating in its fundamental resonance mode at a frequency of around 30 kHz. Measurements in solid 4 He were performed close to the melting pressure. The tuning fork resonance shows substantial frequency shifts on cooling from around 1.5 K to below 10 mK. The response shows an abrupt change at the bcc-hcp transition. At low temperatures, below around 100 mK, the resonance splits into several overlapping resonances.

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“…In solid 4 He the most frequently observed coexistence of bcc-hcp phase is near the pressure P % 25 bar and temperatures T % 1.5 K [1,2,17]. Kurdyumov-Sachs and Nishiyama found the orientation relationships of lattices in the martensitic fcc-bcc phase transition [3].…”

Section: Modelsmentioning

confidence: 99%

“…New experiments showed reversible shift of the phase boundary (PB) at the shifting conditions of phase equilibrium. This fact, as well as the kinetics of the transition [1,2], has given rise to discussion about the analogy between the martensitic transition and phase transition in solid helium. The method of pressure measuring was applied to study the kinetics of the martensite-like transition in helium [2].…”

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Local oscillations in different models of the coherent bcc–hcp boundary in ⁴He and metals

Lykah

Syrkin

2011

Physica Status Solidi (b)

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Small local vibrations of the order parameter (the relative displacement of atomic planes) on the coherent phase boundary (PB) in the bcc-hcp 4 He crystal are investigated theoretically. Dynamical differential equations for small values of the perturbations of the order parameter are obtained. On the coherent PB bcc-hcp for double-and triple-well models the shape and the spectrum are found for small local vibrations of the order parameter. Characteristic frequencies are found and estimated. It is shown that the bcc-hcp boundary in the 4 He crystal is a very soft system. This fact may explain the high degree of damping of 3 He excitations in nuclear magnetic resonance (NMR) experiments.

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Nucleation of crystals at the bcc-hcp transition line in solid4He

Cited by 20 publications

References 18 publications

Optical Observations of Disorder in Solid Helium 4

Optical Observations of Disorder in Solid Helium 4

Response of a Mechanical Oscillator in Solid 4He

Local oscillations in different models of the coherent bcc–hcp boundary in ⁴He and metals

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Nucleation of crystals at the bcc-hcp transition line in solid4He

Cited by 20 publications

References 18 publications

Optical Observations of Disorder in Solid Helium 4

Optical Observations of Disorder in Solid Helium 4

Response of a Mechanical Oscillator in Solid 4He

Local oscillations in different models of the coherent bcc–hcp boundary in 4He and metals

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Product

Resources

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Local oscillations in different models of the coherent bcc–hcp boundary in ⁴He and metals