Experimental evidence for two different dynamical regimes in liquid rubidium

Franz Demmel, Christoph Morkel, D. Holland-Moritz, F. Kargl
2017 EPJ Web of Conferences  
We present evidence for changes in the dynamics of liquid rubidium with rising temperature. The thermal expansion of this liquid alkali metal shows a changing derivative with temperature in a temperature range of about 400-500 K. With neutron scattering the amplitude at the structure factor maximum demonstrates a changing slope with increasing temperature. A derived averaged structural relaxation time can be understood that an additional relaxation process sets in upon cooling. The deduced
more » ... g. The deduced generalized viscosity and high frequency shear modulus indicate a change in dynamics in the same temperature range. All these findings point to a change in dynamics of the equilibrium liquid metal state with a dynamical crossover from a viscous to a fluid-like liquid metal well above the melting point. *
doi:10.1051/epjconf/201715102002 fatcat:6qwinzlgevb7tear6uzljbhlem