Measurements of the atomic kinetic energy of He-4 close to the superfluid transition

Citation
J. Mayers et al., Measurements of the atomic kinetic energy of He-4 close to the superfluid transition, PHYSICA B, 276, 2000, pp. 811-813
Citations number
16
Categorie Soggetti
Apllied Physucs/Condensed Matter/Materiales Science
Journal title
PHYSICA B
ISSN journal
09214526 → ACNP
Volume
276
Year of publication
2000
Pages
811 - 813
Database
ISI
SICI code
0921-4526(200003)276:<811:MOTAKE>2.0.ZU;2-T
Abstract
We report neutron scattering measurements of the kinetic energy (kappa) of He-4 atoms, close to the superfluid transition temperature T-lambda = 2.17 K. We observe a sharp reduction in kappa from 16.3 to 14.8 K over the tempe rature range 2.17 K > T > 2.0 K, giving direct experimental evidence that s uperfluidity is associated with the development of a Bose-Einstein condensa te. (C) 2000 Elsevier Science B.V. All rights reserved.