Generic mechanism for generating a liquid-liquid phase transition

被引:363
作者
Franzese, G [1 ]
Malescio, G
Skibinsky, A
Buldyrev, SV
Stanley, HE
机构
[1] Boston Univ, Ctr Polymer Studies, Boston, MA 02215 USA
[2] Boston Univ, Dept Phys, Boston, MA 02215 USA
[3] Univ Messina, Dipartimento Fis, I-98166 Messina, Italy
[4] Ist Nazl Fis Mat, I-98166 Messina, Italy
关键词
D O I
10.1038/35055514
中图分类号
O [数理科学和化学]; P [天文学、地球科学]; Q [生物科学]; N [自然科学总论];
学科分类号
07 ; 0710 ; 09 ;
摘要
Recent experimental results(1) indicate that phosphorus-a single component system-can have a high-density liquid (HDL) and a low-density liquid (LDL) phase. A first-order transition between two liquids of different densities(2) is consistent with experimental data for a variety of materials(3,4), including single-component systems such as water(5-8), silica(9) and carbon(10). Molecular dynamics simulations of very specific models for supercooled water(2,11), liquid carbon(12) and supercooled silica(13) predict a LDL-HDL critical point, but a coherent and general interpretation of the LDL-HDL transition is lacking. Here we show that the presence of a LDL and a HDL can be directly related to an interaction potential with an attractive part and two characteristic short-range repulsive distances. This kind of interaction is common to other single-component materials in the liquid state (in particular, liquid metals(2,14-21)), and such potentials are often used to describe systems that exhibit a density anomaly(2). However, our results show that the LDL and HDL phases can occur in systems with no density anomaly. Our results therefore present an experimental challenge to uncover a liquid-liquid transition in systems like liquid metals, regardless of the presence of a density anomaly.
引用
收藏
页码:692 / 695
页数:5
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