Physics – Condensed Matter – Soft Condensed Matter
Scientific paper
2004-02-02
Phys. Rev. Lett. 93, 108107 (2004)
Physics
Condensed Matter
Soft Condensed Matter
Scientific paper
10.1103/PhysRevLett.93.108107
We have studied the collective short wavelength dynamics in deuterated DMPC bilayers by inelastic neutron scattering. The corresponding dispersion relation $\hbar\omega$(Q) is presented for the gel and fluid phase of this model system. The temperature dependence of the inelastic excitations indicates a phase coexistence between the two phases over a broad range and leads to a different assignment of excitations than that reported in a preceding inelastic x-ray scattering study [Phys. Rev. Lett. {\bf 86}, 740 (2001)]. As a consequence, we find that the minimum in the dispersion relation is actually deeper in the gel than in the fluid phase. Finally, we can clearly identify an additional non-dispersive (optical) mode predicted by Molecular Dynamics (MD) simulations [Phys. Rev. Lett. {\bf 87}, 238101 (2001)].
Demmel Franz
Fragneto Giovanna
Ollinger C.
Rheinstadter Maikel C.
Salditt Tim
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