Can liquid metal surfaces have hexatic order?

Details Can liquid metal surfaces have hexatic order? Can liquid metal surfaces have hexatic order?

1997-03-17

arxiv.org/abs/cond-mat/9703163v1

Physics

Condensed Matter

Materials Science

4 pages, REVTeX, 4 postscript figures

Scientific paper

10.1103/PhysRevLett.78.3153

We propose that extended orientational correlations can appear at the surface of supercooled heavy noble liquid metals, due to the same compressive forces that cause reconstruction of their crystal surfaces. Simulations for liquid Au show a packed surface layer structurally akin to a defected 2D triangular solid. Upon supercooling, the density of unbound disclinations decreases as expected in Nelson-Halperin's theory. It extrapolates to a hexatic transition about 350 K below melting, where a sharp growth of orientational correlation length and time is also found. True hexatic order is preempted by surface-initiated recrystallisation.

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