Title: Magnetic Properties of the Two Allotropic PuGa3 Phases
Authors: BOULET PascalCOLINEAU ERICWASTIN FRANCKJAVORSKY PavelGRIVEAU JEAN-CHRISTOPHEREBIZANT JEANSTEWART G.r.BAUER E.d.
Citation: PHYSICAL REVIEW B-CONDENSED MATTER vol. 72 p. 064438(1-8)
Publisher: AMERICAN PHYSICAL SOC
Publication Year: 2005
JRC Publication N°: JRC30440
URI: http://publications.jrc.ec.europa.eu/repository/handle/JRC30440
Type: Articles in Journals
Abstract: PuGa3 crystallizes in either a trigonal structure type R-3m or in the hexagonal DO19 type P63 /mmc. The magnetic properties of both allotropes were investigated by magnetization, specific heat, and electrical resistivity measurements down to low temperatures and under magnetic fields and high pressures. Both phases order magnetically; the trigonal modification corresponds to a soft ferromagnet below TC=20 K with a saturated moment of 0.2 B/ Pu, whereas the hexagonal one exhibits antiferromagnetic order below TN=24 K which undergoes a metamagnetic transition at 0HM6.1 T at T=5 K. In the paramagnetic state, the effective magnetic moment inferred from a modified Curie-Weiss law amounts to eff0.78B for both phases, indicative of the occurrence of a Pu3+ charge state. The values of the electronic specific heat coefficient 110 and 220 mJ/mol K2 for the trigonal and hexagonal allotropes, respectively, indicate a moderate heavy fermion character. Comparisons with related compounds PuCoGa5, UGa3, and NpGa3 suggest a strong tendency toward 5f delocalization.
JRC Institute:Institute for Transuranium Elements

Files in This Item:
There are no files associated with this item.


Items in repository are protected by copyright, with all rights reserved, unless otherwise indicated.