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Unified character of correlation effects in unconventional Pu-based superconductors and delta-Pu
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, Materials Theory.
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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
Abstract [en]

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.
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Natural Sciences
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URN: urn:nbn:se:uu:diva-194190DOI: 10.1103/PhysRevB.87.020505ISI: 000313423900002OAI: oai:DiVA.org:uu-194190DiVA: diva2:605189
Available from: 2013-02-13 Created: 2013-02-11 Last updated: 2017-12-06Bibliographically approved

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Rusz, JanOppeneer, P. M.

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