title: Evidence for the R8 phase of germanium.
abstract: The formation of R8 germanium is reported. The β-Sn phase is first induced by the indentation of amorphous germanium (a-Ge) and the resultant phases on pressure release are characterized by Raman scattering. The expected Raman line frequencies for the various phases of Ge are determined from first-principles calculations using density functional perturbation theory of the zone-center phonons in the diamond, ST12, BC8, and R8 Ge phases. In addition to the R8 phase, traces of BC8 may also be present following pressure release.
authors.affiliation: School of Physics, University of Melbourne, Victoria 3010, Australia. johnsonb@unimelb.edu.au
authors.forename: Brett C
authors.initials: BC
authors.lastname: Johnson
authors.forename: Bianca
authors.initials: B
authors.lastname: Haberl
authors.forename: Sarita
authors.initials: S
authors.lastname: Deshmukh
authors.forename: Brad D
authors.initials: BD
authors.lastname: Malone
authors.forename: Marvin L
authors.initials: ML
authors.lastname: Cohen
authors.forename: Jeffrey C
authors.initials: JC
authors.lastname: McCallum
authors.forename: James S
authors.initials: JS
authors.lastname: Williams
authors.forename: Jodie E
authors.initials: JE
authors.lastname: Bradby