Phys. Rev. Lett. 75, 1562–1565 (1995)Vortex Core Size in Submonolayer Superfluid 4He FilmsReceived 23 February 1995; published in the issue dated 21 August 1995 The superfluid density of 4He films adsorbed on 500 Å alumina powder is measured for films with transition temperatures between 50 and 700 mK. The transitions are controlled by the universal Kosterlitz-Thouless line, but a strong increase in the broadening of the transition is observed for the thinnest films. Analysis shows that this broadening results from a vortex core size that increases rapidly as the film is thinned, scaling roughly with the interparticle spacing of the superfluid submonolayer. This system is evidence of a three-dimensional superfluid transition mediated by vortex excitations. © 1995 The American Physical Society URL:
http://link.aps.org/doi/10.1103/PhysRevLett.75.1562
DOI:
10.1103/PhysRevLett.75.1562
PACS:
67.40.Rp, 67.40.Kh, 67.40.Vs, 67.70.+n
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