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  Vacancy-induced flow of solid helium.

Benedek, G., Kalinin, A., Nieto, P., & Toennies, J. P. (2016). Vacancy-induced flow of solid helium. Physical Review B, 93(10): 104505. doi:10.1103/PhysRevB.93.104505.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-002A-0C5D-D Version Permalink: http://hdl.handle.net/11858/00-001M-0000-002D-1932-0
Genre: Journal Article

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 Creators:
Benedek, Giorgio1, Author              
Kalinin, A.1, Author              
Nieto, Pablo1, Author              
Toennies, Jan Peter1, Author              
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1Emeritus Group Molecular Interactions, Max Planck Institute for Dynamics and Self-Organization, Max Planck Society, ou_2063297              

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 Abstract: The pulsed flow of solid 4He through a narrow capillary in a flow system which issues into vacuum is investigated at temperatures between 1.64 and 2.66 K and pressures between 54 and 104 bars. After each pulse three different capillary flow regimes are observed as the upstream pressure decreases: an oscillatory [mini-geyser (MG)] regime, a constant flow (CF) regime with a linearly decreasing pressure difference, and a nonresistant (NR) regime. A quantitative analysis of the three regimes suggests that the flow of solid 4He is driven by a counterflow of excess vacancies, which are injected downstream of the capillary at the solid/liquid interface near the micrometric orifice exposed to vacuum. The CF regime, where the flow velocity is found to be independent of the pressure difference, and the NR regime, where the solid flows as a Bernoulli fluid, suggest a new dynamic phase of solid helium induced by a steady influx of vacancies.

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Language(s): eng - English
 Dates: 2016-03-012016-03-04
 Publication Status: Published in print
 Pages: -
 Publishing info: -
 Table of Contents: -
 Rev. Method: Peer
 Identifiers: DOI: 10.1103/PhysRevB.93.104505
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Title: Physical Review B
Source Genre: Journal
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Pages: 13 Volume / Issue: 93 (10) Sequence Number: 104505 Start / End Page: - Identifier: ISSN: 1098-0121