Ab initio investigation of phonon dispersion and anomalies in palladium
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In recent years, palladium has proven to be a crucial component for devices ranging from nanotube field effect transistors to advanced hydrogen storage devices. In this work, I examine the phonon dispersion of fcc Pd using first principle calculations based on density functional perturbation theory (DFPT). While several groups in the past have studied the acoustic properties of palladium, this is the first study to reproduce the full phonon dispersion and associated anomaly in the -direction with high accuracy and no adjustable parameters. I will show that the  anomaly is a Kohn anomaly due to electron-phonon interactions and that paramagnons play no significant role in the  phonon dispersion.
Calculations were performed on the Intel Cluster at the Cornell Nanoscale Facility which is part of the National Nanotechnology Infrastructure Network funded by the National Science Foundation.
IOP Publishing Ltd and Deutsch Physikalische Gesellschaft
palladium; phonon dispersion; kohn anomaly; density functional theory; density functional perturbation theory; Quantum Espresso
Previously Published As
New Journal of Physics 10, 043025 (2008)