Abstract
Collective dynamics in liquid Ca and liquid Cd was studied by inelastic x-ray scattering (IXS). Using our experimental technique to prepare proper sample cells and high performance of an IXS beamline (BL35XU) at SPring-8 in Japan, the dynamic structure factor with reasonable statistics was obtained for these divalent liquid metals. For both liquids, the dynamic structure factor at low Q exhibits a central peak with a shoulder or small hump clearly visible on each side, and the inelastic excitation energy determined using the model function composed of Lorentzian and the damped harmonic oscillator function disperses with increasing Q . The dispersion curves of these liquids were compared with that of the longitudinal acoustic phonon in each crystalline phase. From these results, clear difference in the interatomic interaction be- tween liquid Ca and liquid Cd was inferred.
Highlights
Atomic dynamics in a liquid has intensively been investigated since inelastic neutron scattering (INS) was found to probe atomic motions in a material [1]
They showed that the density of states (DOS) of liquid Mg is similar to DOS of an free electron gas but DOS of liquid Ca is different from that because d-states in Ca is closer to the Fermi level compared to Mg
The dispersion curves are compared with each other including that of liquid Mg
Summary
Atomic dynamics in a liquid has intensively been investigated since inelastic neutron scattering (INS) was found to probe atomic motions in a material [1]. After an INS study on liquid Rb [2], liquid metals are known to exhibit a distinct inelastic excitation of the collective motion of atoms in the dynamic structure factor S (Q, E), where Q and E are momentum and energy transfer, respectively. Inelastic scattering measurements of liquid alkali metals were carried out by many researchers [3]. Those on alkaline earth metals exist only in a few studies. IXS results of liquid Mg [4] and INS results of liquid Ba and Liquid Ca [5] were reported, the INS results presented excitation energies only at a few Q points.
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