F. Shimojo et al., FIRST-PRINCIPLES MOLECULAR-DYNAMICS SIMULATION OF LIQUID RUBIDIUM UNDER HIGH-PRESSURES, Physical review. B, Condensed matter, 55(9), 1997, pp. 5708-5711
The effects of compression on the structural and electronic properties
of liquid rubidium are studied along the melting curve by means of a
first-principles molecular-dynamics simulation. It is shown that the c
alculated pair distribution functions g(r) are in good agreement with
the experimental results for a wide range of pressures; the liquid rub
idium is compressed uniformly at 2.5 GPa, and there exist some deviati
ons from the uniform compression at 6.1 GPa. This structural change to
a denser state is related to an electronic s-d transition in the liqu
id state. It is found that, near the triple point, the electronic dens
ity of states consists mostly of the s component and, with increasing
pressure, the s component decreases gradually over a wide range of ene
rgy, and the d component near the Fermi level increases.