Daniel Bouexière

Institute for Transuranium Elements, Carlsruhe, Baden-Württemberg, Germany

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Publications (3)5.68 Total impact

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    ABSTRACT: The neptunium analog of the CePt2In7 layered intermetallic compound has been synthesized and characterized by means of resistivity, magnetic susceptibility and heat capacity techniques. Rietveld analysis of the powder x-ray diffraction patterns of NpPt2In7 confirm tetragonal structure type (I4/mmm), with lattice parameters smaller than those previously reported for CePt2In7 and larger than reported for PuPt2In7. Two impurity phases were detected: metallic In and Pt3In7. Both are non-magnetic and therefore do not influence the physical properties measurements of NpPt2In7. NpPt2In7 is an antiferromagnet with the Néel temperature TN = 23 K confirmed by susceptibility and specific heat measurements. A Curie-Weiss fit of the high-temperature magnetic susceptibility curve, chi(T), gives an effective magnetic moment as expected for trivalent Np.
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    ABSTRACT: Here we present bulk property measurements and electronic structure calculations for PuFeAsO, an actinide analog of the iron-based rare-earth superconductors RFeAsO. Magnetic susceptibility and heat capacity data suggest the occurrence of an antiferromagnetic transition at TN = 50 K. No further anomalies have been observed down to 2 K, the minimum temperature that we have been able to achieve. Structural measurements indicate that PuFeAsO, with its more localized 5f electrons, bears a stronger resemblance to the RFeAsO compounds with larger R ions than NpFeAsO does.
    Physical Review B 11/2012; 86(17):174510. · 3.66 Impact Factor
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    ABSTRACT: The ζ-phase, existing between 35% and 70% U in Pu, belongs to the high-density phases seen from the point of view of systematics of allotropic modifications of Pu metal. Despite the volume per actinide atom only slightly higher than for α-Pu, it magnetic susceptibility is much higher than for α-Pu and exceeds even the δ-Pu value. Similarly, the Sommerfeld coefficient γ>40mJ/mol Pu K2 exceeds the experimental δ-Pu value. The data confirm that the volume is not the primary control parameter affecting the situation around the Fermi level of common Pu phases and they point against the traditional belief that they are essentially narrow 5f band systems. Electronic structure calculations suggest that the 5f states of Pu have slightly lower occupancy comparing with δ-Pu. A tendency to the 5f localization can be seen in the Pu dilution situation in the photoelectron spectra.
    Journal of Nuclear Materials 07/2011; 414(3):458-463. · 2.02 Impact Factor