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Article Dans Une Revue Philosophical Magazine Année : 2015

Unusual behaviour of (Np,Pu)B2C

Résumé

Two transuranium metal boron carbides, NpB2C and PuB2C have been synthesized by argon arc melting. The crystal structures of the \Np,Pu\B2C compounds were determined from single-crystal X-ray data to be isotypic with the ThB2C-type (space group [GRAPHICS] , a = 0.6532(2) nm; c = 1.0769(3) nm for NpB2C and a = 0.6509(2) nm; c = 1.0818(3) nm for PuB2C; Z = 9). Physical properties have been derived from polycrystalline bulk material in the temperature range from 2 to 300K and in magnetic fields up to 9 T. Magnetic susceptibility and heat capacity data indicate the occurrence of antiferromagnetic ordering for NpB2C with a Neel temperature T-N = 68K. PuB2C is a Pauli paramagnet most likely due to a strong hybridization of s(p,d) electrons with the Pu-5f states. A pseudo-gap, as concluded from the Sommerfeld value and the electronic transport, is thought to be a consequence of the hybridization. The magnetic behaviour of \Np,Pu\B2C is consistent with the criterion of Hill.

Dates et versions

hal-01344182 , version 1 (11-07-2016)

Identifiants

Citer

Tomasz Klimczuk, Pascal Boulet, Jean-Christophe Griveau, Eric Colineau, Ernst Bauer, et al.. Unusual behaviour of (Np,Pu)B2C. Philosophical Magazine, 2015, 95 (5-6), pp.649-660. ⟨10.1080/14786435.2015.1009520⟩. ⟨hal-01344182⟩
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