PRESSURE-INDUCED ORIENTATIONAL ORDERING IN C-60 SINGLE-CRYSTALS STUDIED BY RAMAN-SPECTROSCOPY

被引：47

作者：

MELETOV, KP

CHRISTOFILOS, D

VES, S

KOUROUKLIS, GA

机构：

[1] RUSSIAN ACAD SCI, INST SOLID STATE PHYS, CHERNOGOLOVKA 142432, RUSSIA

[2] ARISTOTELIAN UNIV THESSALONIKI, DEPT PHYS, SOLID STATE PHYS SECT, GR-54006 THESSALONIKI, GREECE

来源：

PHYSICAL REVIEW B | 1995年 / 52卷 / 14期

关键词：

D O I：

10.1103/PhysRevB.52.10090

中图分类号：

T [工业技术];

学科分类号：

08 ;

摘要：

Raman spectra of C-60 single crystals have been measured as a function of hydrostatic pressure up to 15 GPa at room temperature. Several modes exhibit a reversible softening with pressure in the range 0-0.4 GPa. This behavior is associated with the orientational ordering phase transition from the fee to the partially ordered sc phase. New Raman lines appear above 0.4 GPa, some of them exhibit a softening up to 2.5 GPa. Abrupt changes in the slope of a number of phonons are observed around 2.5 GPa. Also a redistribution of intensity among A(g)(2) and H-g(7) modes, typical of mode interaction, takes place at pressures exceeding 2.5 Cpa. These effects are connected to the phase transition from the partially ordered sc phase to the rotation free orientationally ordered sc phase of C-60 occurring at 2.5 GPa at room temperature.

引用

页码：10090 / 10096

页数：7

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