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High-pressure transformations in liquid rubidium
PHYSICAL REVIEW MATERIALS
An electronic-driven liquid-liquid phase transition in rubidium is revealed by picosecond acoustic measurements combined with ab initio calculations. Picosecond acoustics were used to measure the melting line up to 10 GPa, finding the maximum in the melting curve at 7 GPa and 555 K. We observe the onset of a continuous liquid-liquid phase transition beginning around the melting maxima through until 16 GPa. Sound velocity shows a softening similar to that reported for liquid caesium, caused by adoi:10.1103/physrevmaterials.4.113611 fatcat:ovtkx3lgxbeidi6ha53zbxesyy