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Article Dans Une Revue Physical Review B: Condensed Matter and Materials Physics (1998-2015) Année : 2012

Single-crystal study of the kagome antiferromagnet U3Ru4Al12

Résumé

A ternary intermetallic compound, U3Ru4Al12 in a single-crystal form, was studied by measurement of susceptibility, magnetization, electrical resistivity, magnetoresistivity, thermopower, and heat capacity, as well as neutron diffraction, revealing that this aluminide is an antiferromagnetically ordered (TN = 9.5 K) dense Kondo system (TK ≈ 30 K) with a considerable enhancement of the Sommerfeld coefficient γ(0) of about 200 mJ molU−1 K−2. The electrical resistivity and thermopower of U3Ru4Al12 show characteristic features of the interplay between anisotropic magnetic exchange, Kondo, and crystal field effects. A pronounced in-plane anisotropy and a unique noncollinear antiferromagnetic structure in the (a,b) hexagonal plane, found by neutron diffraction, are discussed in view of the effect of geometrical frustration caused by the distorted kagome lattice of a Gd3Ru4Al12-type crystal structure. Thus, the overall behavior of U3Ru4Al12 resembles that observed for the orthorhombic compound UCu5In, reported earlier as a spin density wave material.

Domaines

Matériaux
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Dates et versions

hal-00815621 , version 1 (19-04-2013)

Identifiants

Citer

R. Troć, Mathieu Pasturel, Olivier Tougait, A.-P. Sazonov, Arsen Gukasov, et al.. Single-crystal study of the kagome antiferromagnet U3Ru4Al12. Physical Review B: Condensed Matter and Materials Physics (1998-2015), 2012, 85 (6), pp.064412. ⟨10.1103/PhysRevB.85.064412⟩. ⟨hal-00815621⟩
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