Role of electron correlation effects in <i>δ</i>-Pu and “115”-Pu-based unconventional superconductors

Alexander B. Shick; Jindrich Kolorenč

doi:10.1016/j.crhy.2014.06.006

Role of electron correlation effects in δ-Pu and “115”-Pu-based unconventional superconductors
[Rôle des effets de corrélation électronique dans δ-Pu et dans les supraconducteurs non conventionnels de la famille Pu-115]

Alexander B. Shick ¹ ; Jindrich Kolorenč ¹

¹ Institute of Physics, ASCR, Na Slovance 2, CZ-18221 Prague, Czech Republic

Comptes Rendus. Physique, Volume 15 (2014) no. 7, pp. 640-647.

Résumé
Abstract

Les méthodes de calcul des structures électroniques qui combinent l'approximation de densité locale avec une diagonalisation exacte du modèle d'impureté d'Anderson prévoyaient, pour δ-Pu et pour PuCoGa₅, un état fondamental de valence intermédiaire 5f⁵–5f⁶, ainsi qu'une délocalisation de la couche électronique 5f du Pu. Le moment magnétique local 5f est compensé par un moment formé dans le milieu des électrons de conduction. Pour PuCoGa₅ et δ-Pu, cette compensation est complète et l'état fondamental de l'impureté d'Anderson est un singulet non magnétique. Ce résultat peut avoir des conséquences importantes sur l'analyse des mécanismes de couplage de Cooper dans PuCoGa₅. Il est possible que la supraconductivité non conventionnelle de symétrie d dans PuCoGa₅ soit véhiculée par des fluctuations de valence des états 5f plutôt que par des fluctuations magnétiques.

Electronic structure calculations combining the local density approximation with an exact diagonalization of the Anderson impurity model show intermediate 5f⁵–5f⁶-valence ground state and delocalization of the 5f⁵ multiplet of the Pu atom 5f-shell in PuCoGa₅, and δ-Pu. The 5f-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 Anderson impurity ground state 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 antiferromagnetic fluctuations.

Publié le : 2014-07-17

DOI : 10.1016/j.crhy.2014.06.006

Keywords: Electronic structure, Strong electron correlations, Photoemission, Unconventional superconductivity
Mot clés : Structure électronique, Corrélations électroniques fortes, Photoémission, Supraconductivité non conventionnelle

Affiliations des auteurs :

Alexander B. Shick ¹ ; Jindrich Kolorenč ¹

¹ Institute of Physics, ASCR, Na Slovance 2, CZ-18221 Prague, Czech Republic

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     title = {Role of electron correlation effects in {\protect\emph{\ensuremath{\delta}}-Pu} and {{\textquotedblleft}115{\textquotedblright}-Pu-based} unconventional superconductors},
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Alexander B. Shick; Jindrich Kolorenč. Role of electron correlation effects in δ-Pu and “115”-Pu-based unconventional superconductors. Comptes Rendus. Physique, Volume 15 (2014) no. 7, pp. 640-647. doi : 10.1016/j.crhy.2014.06.006. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2014.06.006/

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