Fast relaxation in a fragile liquid under pressure

被引：97

作者：

Tolle, A ^{[1
]}

Schober, H

Wuttke, J

Randl, OG

Fujara, F

机构：

[1] Inst Max Von Laue Paul Langevin, F-38042 Grenoble, France

[2] Univ Dortmund, Fachbereich Phys, D-44221 Dortmund, Germany

[3] Tech Univ Munich, Dept Phys, D-85747 Garching, Germany

来源：

PHYSICAL REVIEW LETTERS | 1998年 / 80卷 / 11期

关键词：

D O I：

10.1103/PhysRevLett.80.2374

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

The incoherent dynamic structure factor of orthoterphenyl is studied by quasielastic neutron scattering to 240 MPa. Tagged-particle correlations in the compressed liquid decay in two steps. The alpha-relaxation line shape is independent of pressure, and the relaxation time proportional to viscosity. A kink in the amplitude f(Q)(P) reveals the onset of beta relaxation. The beta-relaxation regime can be described by the mode-coupling scaling function; amplitudes and time scales allow a consistent determination of the critical pressure P-c(T). alpha and beta relaxation depend in the same way on the thermodynamic state; close to P-c(T), this dependence can be parametrized by an effective coupling Gamma proportional to nT(-1/4).

引用

页码：2374 / 2377

页数：4

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