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Phase order in superfluid helium films
UCL, London Ctr Nanotechnol, 17-19 Gordon St, London WC1H 0AJ, England.;UCL, Dept Phys & Astron, London WC1H 0AJ, England..
UCL, London Ctr Nanotechnol, 17-19 Gordon St, London WC1H 0AJ, England.;UCL, Dept Phys & Astron, London WC1H 0AJ, England.;Univ Lyon, Lab Phys, Ecole Normale Super Lyon, F-69364 Lyon 07, France..
Univ Lyon, Lab Phys, Ecole Normale Super Lyon, F-69364 Lyon 07, France..
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy.
2015 (English)In: Europhysics letters, ISSN 0295-5075, E-ISSN 1286-4854, Vol. 112, no 5, article id 56003Article in journal (Refereed) Published
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Abstract [en]

Classic experimental data on helium films are transformed to estimate a finite-size phase order parameter that measures the thermal degradation of the condensate fraction in the two-dimensional superfluid. The order parameter is found to evolve thermally with the exponent beta = 3 pi(2)/128, a characteristic, in analogous magnetic systems, of the Berezinskii-Kosterlitz-Thouless (BKT) phase transition. Universal scaling near the BKT fixed point generates a collapse of experimental data on helium and ferromagnetic films, and implies new experiments and theoretical protocols to explore the phase order. These results give a striking example of experimental finite-size scaling in a critical system that is broadly relevant to two-dimensional Bose fluids. This paper is dedicated to the memory of our friend and colleague Maxime Clusel, with whom we enjoyed many stimulating discussions on related topics.

Place, publisher, year, edition, pages
2015. Vol. 112, no 5, article id 56003
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Condensed Matter Physics
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URN: urn:nbn:se:uu:diva-280114DOI: 10.1209/0295-5075/112/56003ISI: 000369081100018OAI: oai:DiVA.org:uu-280114DiVA, id: diva2:910105
Available from: 2016-03-08 Created: 2016-03-08 Last updated: 2017-11-30Bibliographically approved

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