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Article Dans Une Revue Intermetallics Année : 2011

Crystal structure and physical properties of a new intermetallic compound URu2Al10

Résumé

We report on the existence in the Uâ€"Ruâ€"Al system of a novel compound, URu2Al10, crystallizing in the orthorhombic YbFe2Al10-type structure, where the uranium atoms are caged in Ruâ€"Al polyhedra, forming a clathrate-like structure. Results of the magnetic susceptibility, electrical resistivity in zero and in magnetic fields up to 8 T, thermopower and specific heat, performed in a wide temperature range, are presented. No magnetically ordered state down to the lowest temperature measured has been found. On the basis of (i) the susceptibility anomaly occurring at about 50 K and (ii) the positive magnetoresistivity, growing with applied magnetic field as αBn (n ≈ 3/2), (iii) a characteristic temperature variation of the thermopower, as well as (iv) a moderate value of the Sommerfeld coefficient, a mixed-valence state of uranium in this compound has been postulated. This points to similarities between the presently studied compound and the behaviour of other Ru-containing uranium ternaries, such as U2Ru2Sn and U2RuGa8, classified earlier as valence-fluctuating type materials.

Dates et versions

hal-00822087 , version 1 (14-05-2013)

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R. Troć, Mathieu Pasturel, Olivier Tougait, Michel Potel, Henri Noël. Crystal structure and physical properties of a new intermetallic compound URu2Al10. Intermetallics, 2011, 19 (7), pp.913-918. ⟨10.1016/j.intermet.2011.02.008⟩. ⟨hal-00822087⟩
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