Unified character of correlation effects in unconventional Pu-based superconductors and delta-Pu
2013 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 87, no 2, 020505- p.Article in journal (Refereed) Published
Electronic structure calculations combining the local-density approximation with an exact diagonalization of the Anderson impurity model show an intermediate 5 f(5)-5 f(6)-valence ground state and delocalization of the 5 f(5) multiplet of the Pu atom 5f shell in PuCoIn5, PuCoGa5, and delta-Pu. The 5f local magnetic moment is compensated by a moment formed in the surrounding cloud of conduction electrons. For PuCoGa5 and delta-Pu the compensation is complete, and the Anderson impurity ground state is a singlet. For PuCoIn5 the compensation is partial, and the Pu ground state is magnetic. We suggest that the unconventional d-wave superconductivity is likely mediated by the 5 f-state antiferromagnetic fluctuations in PuCoIn5 and by valence fluctuations in PuCoGa5.
Place, publisher, year, edition, pages
2013. Vol. 87, no 2, 020505- p.
IdentifiersURN: urn:nbn:se:uu:diva-194190DOI: 10.1103/PhysRevB.87.020505ISI: 000313423900002OAI: oai:DiVA.org:uu-194190DiVA: diva2:605189