Fingerprints of electron correlations in plutonium phases: Electronic properties of β-Pu analogs

0522430 - FZÚ 2020 US eng C - Konferenční příspěvek (zahraniční konf.)
Havela, L. - Mašková, S. - Javorský, P. - Kolorenč, Jindřich - Colineau, E. - Griveau, J.C. - Eloirdi, R. - Gouder, T.
Fingerprints of electron correlations in plutonium phases: Electronic properties of β-Pu analogs.
Actinide Research Quarterly - Plutonium Futures - The science 2018. Vol. second quarter. Los Alamos: G.T. Seaborg Institute for Transactinium Science, 2019, s. 1-48.
[Topical Conference on Plutonium and Actinides 2018. San Diego (US), 09.09.2018-14.09.2018]
Institucionální podpora: RVO:68378271
Klíčová slova: electronic structure * plutonium * heat capacity * Sommerfeld coefficient
Obor OECD: Condensed matter physics (including formerly solid state physics, supercond.)
https://www.lanl.gov/discover/publications/actinide-research-quarterly/pdfs/arq-second-quarter-2019-single-page.pdf

The β phase of plutonium metal does not exist at low temperatures, where it transforms to the α phase, therefore its low-temperature heat capacity cannot be determined using direct methods. The β-Pu crystal structure is, however, very similar to that of Pu19Os, which can be cooled close to the 0 K limit. This similarity allowed us to determine the Sommerfeld coefficient of the electronic specific heat for β-Pu. This quantity is of particular importance as it can be used to determine density of states, an essential parameter for predicting material properties. Its record-high value (55 mJ/mol K2) exceeds values for both α- and δ-Pu, with smaller and larger volumes respectively. The non-monotonous behavior of the Sommerfeld coefficient as a function of volume cannot be explained by means of the conventional band theory, which implies that electron-electron correlations play a dominant role in β-Pu.

Trvalý link: http://hdl.handle.net/11104/0306931