Details

Autor(en) / Beteiligte

• Gorelli, F A
• Elatresh, S F
• Guillaume, C L
• Marqués, M
• Ackland, G J
• Santoro, M
• Bonev, S A
• Gregoryanz, E

Titel

Lattice dynamics of dense lithium

Ist Teil von

• Physical review letters, 2012-01, Vol.108 (5), p.055501-055501, Article 055501

Ort / Verlag

United States: American Physical Society

Erscheinungsjahr

2012

Quelle

American Physical Society Journals

Beschreibungen/Notizen

• We report low-frequency high-resolution Raman spectroscopy and ab-initio calculations on dense lithium from 40 to 200 GPa at low temperatures. Our experimental results reveal rich first-order Raman activity in the metallic and semiconducting phases of lithium. The computed Raman frequencies are in excellent agreement with the measurements. Free energy calculations provide a quantitative description and physical explanation of the experimental phase diagram only when vibrational effect are correctly treated. The study underlines the importance of zero-point energy in determining the phase stability of compressed lithium.