title: Elastic and vibrational properties of cobalt to 120 GPa.
abstract: Impulsive stimulated light scattering and Raman spectroscopy measurements have been made on hcp cobalt to a static pressure of 120 GPa. We find that at pressures above 60 GPa the shear elastic modulus and the Raman frequency of the E(2g) transverse optical phonon exhibit a departure from a linear dependence on density. We relate this behavior to a collapse of the magnetic moment under pressure that has been predicted theoretically, but until now not observed experimentally.
authors.affiliation: Lawrence Livermore National Laboratory, 7000 East Avenue, Livermore, California 94551, USA.
authors.forename: Alexander F
authors.initials: AF
authors.lastname: Goncharov
authors.forename: Jonathan
authors.initials: J
authors.lastname: Crowhurst
authors.forename: Joseph M
authors.initials: JM
authors.lastname: Zaug