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Magnetic susceptibility of AnRe/sub 2/ compounds

Journal Article · · J. Appl. Phys.; (United States)
DOI:https://doi.org/10.1063/1.324934· OSTI ID:5122982
The compounds AnRe/sub 2/, where An=Th, U, Np, and Pu all have the MgZn/sub 2/-type hexagonal Laves phase structure. Measurements of their magnetic susceptibilities have been made from 2 to 300 K. Whereas ThRe/sub 2/, URe/sub 2/, and PuRe/sub 2/ have essentially temperature-independent susceptibilities, NpRe/sub 2/ is ferromagnetic with T/sub c/=47 K. The paramagnetic data for NpRe/sub 2/ follow a modified Curie-Weiss law, chi-chi/sub 0/=C/(T-theta) from 60 to 230 K with theta=47.4 K and C equivalent to an effective moment, p/sub eff/=2.11..mu../sub B/. The ordered moment ..mu../sub 0/=0.90..mu../sub B/ and the results are consistent with other actinide compounds having good local moment behavior. The electronic specific heat ..gamma.. of URe/sub 2/=34 mJ/(mole K/sup 2/) is large enough to indicate the possibility of spin-fluctuation behavior in this compound.
Research Organization:
Materials Science Division, Argonne National Laboratory, Argonne, Illinois 60439
OSTI ID:
5122982
Journal Information:
J. Appl. Phys.; (United States), Journal Name: J. Appl. Phys.; (United States) Vol. 49:3; ISSN JAPIA
Country of Publication:
United States
Language:
English