Third-sound study of a layered superfluid film

Zimmerli, Gregory A.; Mistura, Giampaolo; Chan, Moses H. W.

doi:10.1103/physrevlett.68.60

Cited by 112 publications

(98 citation statements)

References 15 publications

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“…There does not seem to be any visible layer completion effects in the isotherm except the initial one, unlike the layering steps seen in Ref. [1]. However, those only became readily visible at lower temperatures than ours; we are currently extending our measurements to lower temperatures where such changes in the third sound velocity may be more noticeable.…”

Section: Methodscontrasting

confidence: 48%

“…The calculation does not include, however, the nearly one additional layer due to the solid layers postulated in in Ref. [1], so our onset thickness could actually be closer to 4 layers. The same calculation for the 1.7 K data gives an onset thickness of 3.85 layers.…”

Section: Methodsmentioning

confidence: 91%

“…We do not observe any obvious oscillations in the third sound velocity due to layering effects, as seen in Refs. [1,4]. It is unclear with the highly curved nature of the nanotube surface that the helium film will still grow in distinct layers.…”

Section: Methodsmentioning

confidence: 99%

“…The adsorption of superfluid films on carbon surfaces has been studied for a number of different bulk substrate types, including graphite foam (grafoil) [1,2], carbon fibers [3], and HOPG graphite [4]. A number of interesting phenomena have been observed in these systems, including layer-by-layer growth of the film thickness, re-entrant superfluidity, and the 2D KosterlitzThouless transition.…”

Section: Introductionmentioning

confidence: 99%

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Third sound in superfluid⁴He films adsorbed on packed multiwall carbon nanotubes

Menachekanian

Williams

2012

J. Phys.: Conf. Ser.

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Abstract. Third sound propagation is observed with thin4 He films adsorbed on multiwall carbon nanotubes. At an average diameter of 12 nm and a length of several microns, the powder of nanotubes is lightly packed into a cylindrical resonator, with a resistor bolometer at the cylinder end to detect the temperature oscillations accompanying the waves. The lowest standing-wave mode in the cavity is excited by mechanical vibrations, with FFT analysis allowing measurement of the sound speed as well as the dissipation. A finite-size broadened Kosterlitz-Thouless onset transition is observed with increasing film thickness on the outside nanotube surfaces for temperatures between 1.3 and 1.7 K. At higher thicknesses capillary condensation becomes important, probably at connection points where the nanotubes touch. We have seen no clear indication of effects that might be attributable to the adsorption of helium on the inner surfaces of the nanotubes.

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Section: Methodscontrasting

confidence: 48%

Section: Methodsmentioning

confidence: 91%

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Third sound in superfluid⁴He films adsorbed on packed multiwall carbon nanotubes

Menachekanian

Williams

2012

J. Phys.: Conf. Ser.

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“…10 However, some measurements have been made of the properties of a second 4 He sheet on top of an incommensurate helium layer, directly in contact with a graphite surface, 11,12,[15][16][17] which can be compared to the simulations on the same subject. 18,19 On the other hand, the second layer of molecular hydrogen on top of graphite has been less explored.…”

Section: Introductionmentioning

confidence: 99%

Second layer of H2and D2adsorbed on graphene

Gordillo

Boronat

2013

Phys. Rev. B

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We report diffusion Monte Carlo calculations on the phase diagrams of para-H 2 and ortho-D 2 adsorbed on top of a first layer of the same substances on graphene. We found that the ground state of the second layer is a triangular incommensurate solid for both isotopes. The densities for promotion to a second layer and for the onset of a two-dimensional solid on that second layer compare favorably with available experimental data in both cases.

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Critical phenomena at interfaces. Phase transitions at quantum surfaces

Leiderer

1994

Ber Bunsenges Phys Chem

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Tlre qnantum systems helium and hydrogen provide a versatile testing ground for studying interfacial phenomena.As examples, both some properties of surface< near thermodynamic equilibrium, like layering and wetting, and uonequilibrium states of qucnch-condensed disordered films are discussed. A further topic is the development of macroscopic instabilities of interfaces under external perturbation. I. Introdrrction TI. Quantum Films Close to EquilibriumSurface phenomena of condensed quantum matter, mostly helium and hydrogen, have raised considerable interest in recent years for a number of reasons. Although not very important for direct applications, these systems display several propertie? which make them ideal candidates for fundamental studies. Since the interactions between the simple atoms and molecules under consideration are accersible from a b initio calculations, good quantitative comparisons between theory and experiments should be possible. Furthermore the systems can be prepared in general under extremely pure and well-defined conditions, As a result of the small mass and low interaction energies, effects due to zero point motion should be particularly prominent in these quantum liquids and solids. The superfIuid transitions in 3~e and 4~e , resulting from quantum stati~tics, add to the intriguing properties of these systems, and there are various novel interfacial phenomena, like melting-crystallization waves, which for various reasons have so far only been observed in quantum systems.Thin film5 of helium and hydrogen with a thickness in the monolayer range have been studied quite thoroughly, both regarding structure and excitations, by means of neutron scattering, specific heat, third sound etc., in particular on substrates with large surface area like exfoliated graphite, as described in several review articles [I]. Here we focus on investigations of films with a thickness beyond 1 monolayer, concentrating on phenomena like layering and wetting, and the annealing of disordered films. At the end we shall also consider the stability of the surfaces of the bulk solid and liquid phases with respect to external perturbations, like electrostatic pressure, and illustrate the formation of surface patterns developing as the system is driven beyond the stability threshold. Due to space limitations only part of the work done on these topics can be presented here, and the selection is certainly biased, most of the examples being taken from our own investigations. Important subjects, in particular the roughening transitions of solid-liquid He interfaces, which are not treated here, have been reviewed elsewhere in the literature [2]. The wetting behavior of He on alkali metals, another question which has raised a large amount of intere~t recently, is discu~sed in this volume by Taborek [ 3 ] .In this section we di~cuss yome structural and dynamic properties of helium and hydrogen surfaces close to thermodynamic equilibrium. In many respects the two materials are qualitatively similar; others, like superfluidit...

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Third-sound study of a layered superfluid film

Cited by 112 publications

References 15 publications

Third sound in superfluid⁴He films adsorbed on packed multiwall carbon nanotubes

Third sound in superfluid⁴He films adsorbed on packed multiwall carbon nanotubes

Second layer of H2and D2adsorbed on graphene

Critical phenomena at interfaces. Phase transitions at quantum surfaces

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Third-sound study of a layered superfluid film

Cited by 112 publications

References 15 publications

Third sound in superfluid4He films adsorbed on packed multiwall carbon nanotubes

Third sound in superfluid4He films adsorbed on packed multiwall carbon nanotubes

Second layer of H2and D2adsorbed on graphene

Critical phenomena at interfaces. Phase transitions at quantum surfaces

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Product

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Third sound in superfluid⁴He films adsorbed on packed multiwall carbon nanotubes

Third sound in superfluid⁴He films adsorbed on packed multiwall carbon nanotubes