Surprising behavior of the superfluid fraction for 4He and 3He-4He mixtures in 18.5 nm channels

Mark O. Kimball; Manuel Diaz-Avila; Francis M. Gasparini

doi:10.1016/S0921-4526(02)01978-6

Surprising behavior of the superfluid fraction for ⁴He and ³He-⁴He mixtures in 18.5 nm channels

Mark O. Kimball
, Manuel Diaz-Avila
, Francis M. Gasparini

Physics

SUNY Buffalo

Research output: Contribution to journal › Conference article › peer-review

5 Scopus citations

Abstract

We have obtained the superfluid fraction of ⁴He and mixtures confined in channels 0.0185 μm×1.08 μm×∞. We compare this with film data L×∞×∞, and data for channels 0.0483 μm×3.0 μm×∞. The behavior of the data in the smallest channels is quite different from what one might expect for a planar film of a given thickness. The transition is shifted to a lower temperature than expected; and, the overall behavior of ρ_s does not follow the trend observed with other confined films. This suggests that the lateral dimension plays a significant role in the behavior. We believe our observations are consistent with the recent proposal of Sobnack and Kusmartsev about a new mechanism for vortex unbinding in 2D films.

Original language	English
Pages (from-to)	248-249
Number of pages	2
Journal	Physica B: Condensed Matter
Volume	329-333
DOIs	https://doi.org/10.1016/S0921-4526(02)01978-6
State	Published - May 2003
Event	Proceedings of the 23rd international conference on low temper - Hiroshima, Japan Duration: Aug 20 2002 → Aug 27 2002

Keywords

Confined helium
Finite-size scaling
Helium mixtures
Superfluid density

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10.1016/S0921-4526(02)01978-6

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title = "Surprising behavior of the superfluid fraction for 4He and 3He-4He mixtures in 18.5 nm channels",

abstract = "We have obtained the superfluid fraction of 4He and mixtures confined in channels 0.0185 μm{\texttimes}1.08 μm{\texttimes}∞. We compare this with film data L{\texttimes}∞{\texttimes}∞, and data for channels 0.0483 μm{\texttimes}3.0 μm{\texttimes}∞. The behavior of the data in the smallest channels is quite different from what one might expect for a planar film of a given thickness. The transition is shifted to a lower temperature than expected; and, the overall behavior of ρs does not follow the trend observed with other confined films. This suggests that the lateral dimension plays a significant role in the behavior. We believe our observations are consistent with the recent proposal of Sobnack and Kusmartsev about a new mechanism for vortex unbinding in 2D films.",

keywords = "Confined helium, Finite-size scaling, Helium mixtures, Superfluid density",

author = "Kimball, \{Mark O.\} and Manuel Diaz-Avila and Gasparini, \{Francis M.\}",

year = "2003",

month = may,

doi = "10.1016/S0921-4526(02)01978-6",

language = "English",

volume = "329-333",

pages = "248--249",

journal = "Physica B: Condensed Matter",

issn = "0921-4526",

publisher = "Elsevier B.V.",

note = "Proceedings of the 23rd international conference on low temper ; Conference date: 20-08-2002 Through 27-08-2002",

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TY - JOUR

T1 - Surprising behavior of the superfluid fraction for 4He and 3He-4He mixtures in 18.5 nm channels

AU - Kimball, Mark O.

AU - Diaz-Avila, Manuel

AU - Gasparini, Francis M.

PY - 2003/5

Y1 - 2003/5

N2 - We have obtained the superfluid fraction of 4He and mixtures confined in channels 0.0185 μm×1.08 μm×∞. We compare this with film data L×∞×∞, and data for channels 0.0483 μm×3.0 μm×∞. The behavior of the data in the smallest channels is quite different from what one might expect for a planar film of a given thickness. The transition is shifted to a lower temperature than expected; and, the overall behavior of ρs does not follow the trend observed with other confined films. This suggests that the lateral dimension plays a significant role in the behavior. We believe our observations are consistent with the recent proposal of Sobnack and Kusmartsev about a new mechanism for vortex unbinding in 2D films.

AB - We have obtained the superfluid fraction of 4He and mixtures confined in channels 0.0185 μm×1.08 μm×∞. We compare this with film data L×∞×∞, and data for channels 0.0483 μm×3.0 μm×∞. The behavior of the data in the smallest channels is quite different from what one might expect for a planar film of a given thickness. The transition is shifted to a lower temperature than expected; and, the overall behavior of ρs does not follow the trend observed with other confined films. This suggests that the lateral dimension plays a significant role in the behavior. We believe our observations are consistent with the recent proposal of Sobnack and Kusmartsev about a new mechanism for vortex unbinding in 2D films.

KW - Confined helium

KW - Finite-size scaling

KW - Helium mixtures

KW - Superfluid density

UR - https://www.scopus.com/pages/publications/17344391439

U2 - 10.1016/S0921-4526(02)01978-6

DO - 10.1016/S0921-4526(02)01978-6

M3 - Conference article

AN - SCOPUS:17344391439

SN - 0921-4526

VL - 329-333

SP - 248

EP - 249

JO - Physica B: Condensed Matter

JF - Physica B: Condensed Matter

T2 - Proceedings of the 23rd international conference on low temper

Y2 - 20 August 2002 through 27 August 2002

ER -

Surprising behavior of the superfluid fraction for ⁴He and ³He-⁴He mixtures in 18.5 nm channels

Abstract

Keywords

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