Role of electron correlation effects in δ-Pu and "115"-Pu-based unconventional superconductors

0441298 - FZÚ 2015 RIV FR eng J - Journal Article
Shick, Alexander - Kolorenč, Jindřich
Role of electron correlation effects in δ-Pu and "115"-Pu-based unconventional superconductors.
Comptes Rendus Physique. Roč. 15, č. 7 (2014), 640-647. ISSN 1631-0705. E-ISSN 1878-1535
R&D Projects: GA ČR(CZ) GAP204/10/0330
Institutional support: RVO:68378271
Keywords : electronic structure * strong electron correlations * photoemission * unconventional superconductivity
Subject RIV: BM - Solid Matter Physics ; Magnetism
Impact factor: 2.035, year: 2014

Electronic structure calculations combining the local density approximation with the exact diagonalization of the Anderson impurity model show intermediate-valence ground state and delocalization of the Pu atom 5f-shell in PuCoGa5 and in δ-Pu. The local magnetic moment is compensated by a moment formed in the surrounding cloud of conduction electrons. For PuCoGa5 and δ-Pu the compensation is complete and the ground state of the Anderson impurity model is a singlet. This can be important for analyses of the superconducting pairing mechanism in PuCoGa5. It is likely that in PuCoGa5 unconventional d-wave superconductivity is mediated by the 5f-states valence fluctuations, rather than by antiferromagnetic fluctuations.
Permanent Link: http://hdl.handle.net/11104/0244338