Evidence for a Common Physical Origin of the Landau and BEC Theories of Superfluidity

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

doi:10.1103/PhysRevLett.113.215302

Evidence for a Common Physical Origin of the Landau and BEC Theories of Superfluidity

Journal Article · Thu Nov 20 00:00:00 EST 2014 · Physical Review Letters

DOI:https://doi.org/10.1103/PhysRevLett.113.215302· OSTI ID:1286799

Diallo, Souleymane Omar ^[1]; Azuah, R. T. ^[2]; Abernathy, D. L. ^[1]; Taniguchi, Junko ^[3]; Suzuki, Masaru ^[3]; Bossy, Jacques ^[4]; Mulders, N. ^[5]; Glyde, H. R. ^[5]

Oak Ridge National Lab. (ORNL), Oak Ridge, TN (United States). Quantum Condensed Matter Division
National Inst. of Standards and Technology (NIST), Gaithersburg, MD (United States). Center for Neutron Research; Univ. of Maryland, College Park, MD (United States). Dept. of Materials Science and Engineering
Univ. of Electro-Communications, Chofu, Tokyo (Japan). Dept. of Engineering Science
Centre National de la Recherche Scientifique (CNRS), Grenoble (France). Inst. Neel
Univ. of Delaware, Newark, DE (United States). Dept. of Physics and Astronomy

There are two renowned theories of superfluidity in liquid ⁴He, 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 ⁴He, 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 ⁴He 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, T_c, 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.

View Accepted Manuscript (DOE)

Research Organization:: Oak Ridge National Laboratory (ORNL), Oak Ridge, TN (United States). Spallation Neutron Source

Sponsoring Organization:: USDOE Office of Science (SC), Basic Energy Sciences (BES); USDOE Office of Science (SC), Basic Energy Sciences (BES) (SC-22)

Grant/Contract Number:: AC05-00OR22725; FG02-03ER46038

OSTI ID:: 1286799

Alternate ID(s):: OSTI ID: 1181009

Journal Information:: Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 21 Vol. 113; ISSN 0031-9007; ISSN PRLTAO

Publisher:: American Physical Society (APS)Copyright Statement

Country of Publication:: United States

Language:: English

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Excitations in the quantum liquid ⁴ He: A review Glyde, H. R. Reports on Progress in Physics, Vol. 81, Issue 1 https://doi.org/10.1088/1361-6633/aa7f90	journal	November 2017
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Superfluidity, Bose-Einstein condensation, and structure in one-dimensional Luttinger liquids Vranješ Markić, L.; Vrcan, H.; Zuhrianda, Z. Physical Review B, Vol. 97, Issue 1 https://doi.org/10.1103/physrevb.97.014513	journal	January 2018
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