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- Carnegie Institution for ScienceUS218 papers
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6 papers · 2 filters
Evidence of local magnetic order in hcp iron from Raman mode splitting
Gerd Steinle-Neumann, Lars Stixrude, R. E. Cohen +1
Experimental measurements of Raman spectra for hcp iron at high pressure show two modes over a considerable pressure range in contrast to the prediction of one doubly degenerate mo…
New Phases of Solid Nitrogen
Eugene Gregoryanz, Alexander Goncharov, Russell J. Hemley +3
We report the discovery of a new class of molecular phases of solid nitrogen at high pressures and temperatures by Raman and infrared spectroscopy and powder x-ray diffraction. Unl…
High Pressure Thermoelasticity of Body-centered Cubic Tantalum
O. Gulseren, R. E. Cohen
We have investigated the thermoelasticity of body-centered cubic (bcc) tantalum from first principles by using the linearized augmented plane wave (LAPW) and mixed--basis pseudopot…
Spectroscopic Studies of the Vibrational and Electronic Properties of Solid Hydrogen to 285 GPa
Alexander F. Goncharov, Eugene Gregoryanz, Russell J. Hemley +1
We report Raman scattering and visible to near-infrared absorption spectra of solid hydrogen under static pressure up to 285 GPa at 85-140 K. We obtain pressure dependences of vibr…
Importance of Magnetism in Phase Stability, Equations of State, and Elasticity
R. E. Cohen, S. Gramsch, G. Steinle-Neumann +1
The effects of magnetism on high pressure properties of transition metals and transition metal compounds can be quite important. In the case of Fe, magnetism is responsible for sta…
High-Pressure Amorphous Nitrogen
Eugene Gregoryanz, Alexander F. Goncharov, Russell J. Hemley +1
The phase diagram and stability limits of diatomic solid nitrogen have been explored in a wide pressure--temperature range by several optical spectroscopic techniques. A newly char…