The physical properties of the first In analog of the PuMGa5 (M=Co, Rh) family of superconductors, PuCoIn5, are reported. With its unit cell volume being 28% larger than that of PuCoGa5, the characteristic spin-fluctuation energy scale of PuCoIn5 is three to four times smaller than that of PuCoGa5, which suggests that the Pu 5f electrons are in a more localized state relative to PuCoGa5. This raises the possibility that the high superconducting transition temperature Tc = 18.5 K in PuCoGa5 stems from proximity to a valence instability, while superconductivity at Tc = 2.5 K in PuCoIn5 is mediated by antiferromagnetic spin fluctuations associated with a quantum critical point.
BAUER E.D.;
ALTARAWNEH M. M.;
TOBASH Paul Henry;
GOFRYK Krzysztof;
AYALA-VALENZUELA O. E.;
MITCHELL J. N.;
MCDONALD R. D.;
MIELKE C. H.;
RONNING F;
GRIVEAU Jean-Christophe;
COLINEAU Eric;
ELOIRDI Rachel;
CACIUFFO Roberto;
SCHOTT B. L.;
JANKA O.;
KAUZLARICH S. M.;
THOMPSON J.D.;
2012-02-03
IOP PUBLISHING LTD
JRC66912
0953-8984,
http://iopscience.iop.org/0953-8984/24/5/052206/,
https://publications.jrc.ec.europa.eu/repository/handle/JRC66912,
10.1088/0953-8984/24/5/052206,
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