Departmental Papers (ESE)

Abstract

Compton scattering has been shown to be a powerful tool for studying the ground state electronic density in real materials. Using synchrotron radiation, we have studied pressure effects on Rb4C60 by measuring the Compton profiles below and above the insulator to metal transition at 0.8 GPa. The experimental results are compared with the corresponding calculated results, obtained from new ab initio energy band structure calculations. These results allow us to quantitatively evaluate contributions to the Compton profiles resulting from the contraction of the unit cell as well as from the contraction of the C60 molecule itself. In this paper, we point out an unexpected contraction of the volume of the C60 molecule, leading to a major effect on the electronic density of the Rb4C60 compound.

Document Type

Journal Article

Date of this Version

August 2005

Comments

Copyright American Physical Society. Reprinted from Physical Review B, Volume 72, Issue 8, Article 085412, August 2005, 8 pages.
Publisher URL: http://dx.doi.org/10.1103/PhysRevB.72.085412

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Date Posted: 25 February 2006

This document has been peer reviewed.