Plasmons in Li under compression
Abstract
We report the high-pressure behavior of plasmon in polycrystalline Li up to 15 GPa at room temperature studied by inelastic x-ray scattering and ab initio calculation. The plasmon energy ([ image ]) increases with decreasing atomic volume ([ image ]), and the [ image ] slope exhibits a discontinuity at bcc → fcc structural phase boundary reflecting the electronic band structure change. The plasmon peak width ([ image ]) versus momentum transfer (q) curve of bcc-Li below 6.5 GPa keeps similar parabola-like shape. Above 8.4 GPa, where Li is in fcc, it changes from that of bcc-Li and has a convex shape.
- Publication:
-
Journal of Physics Condensed Matter
- Pub Date:
- May 2019
- DOI:
- 10.1088/1361-648X/ab0528
- Bibcode:
- 2019JPCM...31r5501M
- Keywords:
-
- plasmon;
- inelastic x-ray scattering;
- DAC;
- synchrotron;
- ab initio calculation;
- lithium