- Ladislav Havela: Fingerprints of electron correlations in various phases of Plutonium: Electronic properties of Pu19Os simulating β-Pu
- 31. 10. 2018, 14:00
- lecture room F2, first floor Ke Karlovu 5
- more information
Abstract:
The position of Plutonium right at the 5f-localization threshold in the actinides series suggests a general importance of electron-electron correlations in electronic as well as lattice properties. As the correlations cannot be sufficiently well described by conventional DFT calculations, the necessity to quantify the energetics in Pu and Pu-based systems led to development of a new paradigm, the Dynamical Mean Field theory (DMFT), capable to describe many-electron systems including e-e correlations and excitations. Still a large diversity of approaches within the DMFT framework, representing different approximations, brings up the question which type of method is capturing particular properties. Feedback of reliable experimental data covering different regimes of the 5f states in pure Pu allotropes, compounds and alloys, is indispensable. Here we want to compare the knowledge of individual allotropic phases of pure and alloyed Pu from the point of view of basic bulk properties reflecting e-e correlation with existing spectroscopic information. Special emphasis will be put on the Sommerfeld coefficient of electronic specific heat and how to overcome difficulties associated with radioactive samples.
Based on: L. Havela, S. Mašková, J. Kolorenč, E. Colineau, J.-C. Griveau, R. Eloirdi, “ Electronic properties of Pu19Os simulating β-Pu: the strongly correlated Pu phase,“ J. Phys. Cond. Mat. 30 085601 (2018).