Physics – Condensed Matter – Disordered Systems and Neural Networks
Scientific paper
2002-08-30
Physics
Condensed Matter
Disordered Systems and Neural Networks
LaTex format, 11 pages, 4 EncapsulatedPostScript figures
Scientific paper
10.1103/PhysRevLett.89.255506
The microscopic dynamics in liquid gallium (l-Ga) at melting (T=315 K) has been studied by inelastic x-ray scattering. We demonstrate the existence of collective acoustic-like modes up to wave-vectors above one half of the first maximum of the static structure factor, at variance with earlier results from inelastic neutron scattering data [F.J. Bermejo et al. Phys. Rev. E 49, 3133 (1994)]. Despite the structural (an extremely rich polymorphism and rather complex phase diagram) and electronic (mixed valence) peculiarity of l-Ga, its collective dynamics is strikingly similar to the one of Van der Walls and alkali metals liquids. This result speaks in favor of the universality of the short time dynamics in monatomic liquids rather than of system-specific dynamics.
Filipponi A.
Krisch Michael
Monaco Giulio
Ruocco Giancarlo
Scopigno Tullio
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