ROTATIONAL ORDERING TRANSITION IN SINGLE-CRYSTAL C-60 STUDIED BY RAMAN-SPECTROSCOPY

被引：114

作者：

VANLOOSDRECHT, PHM

VANBENTUM, PJM

MEIJER, G

机构：

[1] Research Institute of Materials, University of Nijmegen, Toernooiveld

来源：

PHYSICAL REVIEW LETTERS | 1992年 / 68卷 / 08期

关键词：

D O I：

10.1103/PhysRevLett.68.1176

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Raman spectroscopic data are presented on the rotational ordering fcc --> sc transition in single-crystal C60. Splittings and activation of new modes reveal the influence of the cubic structure, and are in agreement with the crystal symmetry in both phases. The temperature dependence of the spectra is consistent with a sharp first-order phase transition near 252 K. A simple model is proposed for the explanation of the temperature dependence of the spectra, involving a large vibrational-rotational coupling in the fcc phase, and essentially no rotational disorder in the sc phase.

引用

页码：1176 / 1179

页数：4

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