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@ARTICLE{Ding:1037544,
      author       = {Ding, Jingxuan and Gupta, Mayanak K. and Rosenbach, Carolin
                      and Lin, Hung-Min and Osti, Naresh C. and Abernathy, Douglas
                      L. and Zeier, Wolfgang and Delaire, Olivier},
      title        = {{L}iquid-like dynamics in a solid-state lithium
                      electrolyte},
      journal      = {Nature physics},
      volume       = {21},
      issn         = {1745-2473},
      address      = {Basingstoke},
      publisher    = {Nature Publishing Group},
      reportid     = {FZJ-2025-00733},
      pages        = {118–125},
      year         = {2025},
      abstract     = {Superionic materials represent a regime intermediate
                      between the crystalline and liquid states of matter. Despite
                      the considerable interest in potential applications for
                      solid-state batteries or thermoelectric devices, it remains
                      unclear whether the fast ionic diffusion observed in
                      superionic materials reflects liquid-like dynamics or
                      whether the hops of mobile ions are inherently coupled to
                      more conventional lattice phonons. Here we reveal a
                      crossover from crystalline vibrations to relaxational
                      dynamics of ionic diffusion in the superionic compound
                      $Li_6PS_5Cl$, a candidate solid-state electrolyte. By
                      combining inelastic and quasi-elastic neutron-scattering
                      measurements with first-principles-based machine-learned
                      molecular dynamics simulations, we found that the
                      vibrational density of states in the superionic state
                      strongly deviates from the quadratic behaviour expected from
                      the Debye law of lattice dynamics. The superionic dynamics
                      emerges from overdamped phonon quasiparticles to give rise
                      to a linear density of states characteristic of
                      instantaneous normal modes in the liquid state. Further, we
                      showed that the coupling of lattice phonons with a dynamic
                      breathing of the $Li^+$ diffusion bottleneck enables an
                      order-of-magnitude increase in diffusivity. Thus, our
                      results shed insights into superionics for future energy
                      storage and conversion technologies.},
      cin          = {IMD-4},
      ddc          = {530},
      cid          = {I:(DE-Juel1)IMD-4-20141217},
      pnm          = {1221 - Fundamentals and Materials (POF4-122)},
      pid          = {G:(DE-HGF)POF4-1221},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:001390246300001},
      doi          = {10.1038/s41567-024-02707-6},
      url          = {https://juser.fz-juelich.de/record/1037544},
}