The dynamic pair distribution function of superfluid $^{4}$He

ORAL

Abstract

We present precision neutron scattering measurements of the spatial and time correlations between atoms in liquid $^{4}$He using dynamic pair distribution methods. As the Bose-Einstein condensate (BEC) sets in below the superfluid transition temperature $T_{\lambda}$, we observe clear changes in the local environment of the atoms. These local changes are investigated beyond the first coordination shell. We also test our observations against recent classical and ab-initio molecular dynamics simulations in which the local configurational excitations in the atomic connectivity network was found to be the elementary excitation in some liquid metals.

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Authors

  • Souleymane Diallo

    • Oak Ridge National Laboratory

  • Wojciech Dmowski

    • Oak Ridge National Laboratory / University of Tennessee

  • Kostantin Lokshin

    • Oak Ridge National Laboratory / University of Tennessee

  • Georg Ehlers

    • Spallation Neutron Source, Oak Ridge National Laboratory
    • Oak Ridge National Laboratory
    • Quantum Condensed Matter Division, Oak Ridge National Laboratory

  • Takeshi Egami

    • Oak Ridge National Laboratory / University of Tennessee
    • The University of Tennessee