Physics – Condensed Matter – Materials Science
Scientific paper
2009-10-09
Physics
Condensed Matter
Materials Science
Scientific paper
10.1103/PhysRevLett.104.065702
We have mapped the molecular-atomic transition in liquid hydrogen using first principles molecular dynamics. We predict that a molecular phase with short-range orientational order exists at pressures above 100 GPa. The presence of this ordering and the structure emerging near the dissociation transition provide an explanation for the sharpness of the molecular-atomic crossover and the concurrent pressure drop at high pressures. Our findings have non-trivial implications for simulations of hydrogen; previous equation of state data for the molecular liquid may require revision. Arguments for the possibility of a $1^{st}$ order liquid-liquid transition are discussed.
Bonev Stanimir A.
Tamblyn Isaac
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