Can liquid metal surfaces have hexatic order?

被引:44
作者
Celestini, F [1 ]
Ercolessi, F [1 ]
Tosatti, E [1 ]
机构
[1] INT CTR THEORET PHYS, I-34014 TRIESTE, ITALY
关键词
D O I
10.1103/PhysRevLett.78.3153
中图分类号
O4 [物理学];
学科分类号
0702 ;
摘要
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 recrystallization.
引用
收藏
页码:3153 / 3156
页数:4
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