Evidence for a common physical origin of the Landau and BEC theories of superfluidity.

Diallo, S O; Azuah, R T; Abernathy, D L; Taniguchi, Junko; Suzuki, Masaru; Bossy, Jacques; Mulders, N; Glyde, H R

Diallo, S O; Azuah, R T; Abernathy, D L; Taniguchi, Junko; Suzuki, Masaru; Bossy, Jacques; Mulders, N; Glyde, H R.

Afiliación

Diallo SO; Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Azuah RT; NIST Center for Neutron Research, Gaithersburg, Maryland 20899-8562, USA and Department of Materials Science and Engineering, University of Maryland, College Park, Maryland 20742-2115, USA.
Abernathy DL; Quantum Condensed Matter Division, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA.
Taniguchi J; Department of Engineering Science, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan.
Suzuki M; Department of Engineering Science, University of Electro-Communications, Chofu, Tokyo 182-8585, Japan.
Bossy J; Institut Néel, CNRS-UJF, BP 166, 38042 Grenoble Cedex 9, France.
Mulders N; Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716-2593, USA.
Glyde HR; Department of Physics and Astronomy, University of Delaware, Newark, Delaware 19716-2593, USA.

Phys Rev Lett ; 113(21): 215302, 2014 Nov 21.

Article en En | MEDLINE | ID: mdl-25479500

RESUMEN

There are two renowned theories of superfluidity in liquid (4)He, quite different and each with specific domains of application. In the first, the Landau theory, superflow follows from the existence of a well-defined collective mode supported by dense liquid (4)He, the phonon-roton mode. In the second, superflow is a manifestation of Bose-Einstein condensation (BEC) and phase coherence in the liquid. We present combined measurements of superfluidity, BEC and phonon-roton (P-R) modes in liquid (4)He confined in the porous medium MCM-41. The results integrate the two theories by showing that well-defined P-R modes exist where there is BEC. The two are common properties of a Bose condensed liquid and either can be used as a basis of a theory of superfluidity. In addition, the confinement and disorder suppresses the critical temperature for superfluidity, Tc, below that for BEC creating a localized BEC "phase" consisting of islands of BEC and P-R modes. This phase is much like the pseudogap phase in the cuprate superconductors.

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Colección: 01-internacional Base de datos: MEDLINE Idioma: En Revista: Phys Rev Lett Año: 2014 Tipo del documento: Article País de afiliación: Estados Unidos Pais de publicación: Estados Unidos

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