Collective dynamics of liquid potassium studied by inelastic neutron scattering

Dispersion curves of collective excitations have been obtained from the data on inelastic scattering on liquid potassium at 340 and 550 K for the wave-vector transfer region of 1.0 ⩽ Q ⩽ 1.3 A ̊ −1 . Experimental points were described in the frame of a model for longitudinal collective modes. In usi...

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Bibliographic Details
Published in:Physica. B, Condensed matter Condensed matter, 1997-06, Vol.234, p.359-361
Main Authors: Novikov, A.G., Savostin, V.V., Shimkevich, A.L., Zaezjev, M.V.
Format: Article
Language:English
Subjects:
Liquids
Metals
Phonon dispersion
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Summary:Dispersion curves of collective excitations have been obtained from the data on inelastic scattering on liquid potassium at 340 and 550 K for the wave-vector transfer region of 1.0 ⩽ Q ⩽ 1.3 A ̊ −1 . Experimental points were described in the frame of a model for longitudinal collective modes. In using the values of model paramters ω E and r 0, the shear modulus and the high-frequency sound velocity have been evaluated. The latter seems to exceed the adiabatic sound velocity beyond the hydrodynamic limit ( Q > 0.1 A ̊ −1 ) near the melting point due to the effects of shear relaxation. This is the characteristic feature of liquid alkali metals.
ISSN:0921-4526
1873-2135
DOI:10.1016/S0921-4526(96)00987-8