PHASE-TRANSITION IN ULTRATHIN BI FILMS

被引：49

作者：

MITCH, MG

CHASE, SJ

FORTNER, J

YU, RQ

LANNIN, JS

机构：

[1] Department of Physics, Pennsylvania State University, University Park

来源：

PHYSICAL REVIEW LETTERS | 1991年 / 67卷 / 07期

关键词：

D O I：

10.1103/PhysRevLett.67.875

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

Dynamical studies of Bi ultrathin films prepared on carbon at 110 K exhibit a phase transition from nanocrystalline to amorphouslike clusters. Evidence for the transition at a thickness of approximately 8 angstrom is provided by the form, intensity, and polarization dependence of in situ Raman-scattering measurements in ultrahigh vacuum. A substantial increase in frequency of the opticlike band with decreasing thickness indicates increased covalent interactions. This contrasts with superconducting Bi films, suggesting a semiconducting amorphous state in clusters.

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页码：875 / 878

页数：4

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