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Paper   IPM / P / 8319
School of Physics
  Title:   In Situ Pressure Study of Rb4C60 Insulator to Metal
1.  A.A. Sabouri-Dodaran
2.  Ch . Bellin
3.  G. Loupias
4.  M. Marangolo
5.  S. Rabii
6.  F. Rachdi
7.  Th. Buslaps
8.  M. Mezouar
  Status:   Published
  Journal: Phys. Rev. B
  Vol.:  72
  Year:  2005
  Pages:   085412
  Supported by:  IPM
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.

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