Kondo-like behavior in ThAsSe and UAsSe

Schoenes, J.; Withers, Raymond; Hulliger, F.

doi:10.1016/j.jmmm.2006.10.672

Cited by 7 publications

(4 citation statements)

References 8 publications

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“…We would like also to mention UNiSi 2 with a Curie temperature T C = 95 K [12][13][14], UCo 0.6 Ni 0.4 Si 2 with T C = 62 K [15] and URu 2−x Re x Si 2 compounds where T C increases rapidly with concentration x [16][17][18]. The same kind of coexistence has been recently observed in UAsSe with a T C = 109 K [19] and in the neptunium compound NpNiSi 2 , which becomes ferromagnetic at T C = 51.5 K and presents a Kondo behavior [20].…”

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confidence: 60%

Coexistence of ferromagnetism and Kondo effect in the underscreened Kondo lattice

et al. 2007

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The coexistence of ferromagnetic order and Kondo behavior, that has been experimentally observed in some uranium compounds, is studied in the framework of an underscreened Kondo lattice model within the mean-field approach. For small values of JK compared to the bandwidth, a ferromagnetically ordered solution is obtained, while for larger values of JK a Kondo regime occurs with a Kondo temperature larger than the Curie temperature, suggesting a scenario for the coexistence of Kondo effect and ferromagnetic order.

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confidence: 60%

Coexistence of ferromagnetism and Kondo effect in the underscreened Kondo lattice

et al. 2007

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“…The physical properties of several ternary actinide metal compounds MAsSe (M = U, Th) were intensively investigated, but little information on crystallographic details and relations to the chemical composition are available . Phases near the equiatomic composition MAsSe crystallize in the ZrSiS type of structure (space group P 4/ nmm , alternatively designated as PbFCl type) and display a typical magnetic-field independent rise of the electrical resistivity toward lower temperatures (<20 K), which might be explained by a nonmagnetic Kondo effect .…”

Section: Introductionmentioning

confidence: 99%

CeAsSeSynthesis, Crystal Structure, and Physical Properties

Schlechte¹,

Niewa²,

Prots³

et al. 2009

Inorg. Chem.

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Single crystals of CeAsSe were synthesized by a reaction of the elements using iodine as a mineralization agent at 900 degrees C. The crystal structure was established from single crystal X-ray diffraction data and obtained from a pseudomerohedrically twinned specimen (space group Pnma, a = 5.7969(1) A, b = 5.7664(1) A, and c = 17.8196(6) A; Z = 8). CeAsSe crystallizes in the GdPS type of structure and contains infinite cis-trans chains of arsenic atoms, packed between two-dimensional slabs of alternating Ce and Se atoms. The chemical composition of the investigated crystals was determined to be CeAs(1.01(1))Se(0.99(3)). High-resolution diffraction experiments with synchrotron radiation clearly evidence the orthorhombic metric. However, variations in composition or temperature profile in the synthesis procedure lead to vanishing distortion, that is, disappearance of reflection splitting and superstructure reflections, and thus to a tetragonal metric within the resolution of the synchrotron-based diffraction experiments. CeAsSe can be expressed as consisting of Ce(3+), As(1-), and Se(2-) as an electronic precise Zintl-type compound. This interpretation is consistent with the results of X-ray absorption spectroscopy at the Ce-L(III) edge and magnetic susceptibility data. The temperature dependence of a semiconductor was observed in electrical resistivity measurements.

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“…Our measurements of bulk properties (see below) show that Np 2 PtGa 3 orders ferromagnetically at 26 K. Additionally, the coefficient of the electronic specific heat of γ = 180 mJ/(mol at.Np K 2 ) is sizeably enhanced, together with -lnT dependence of the electrical resistivity, classifying Np 2 PtGa 3 to belong to relatively rare family of ferromagnetic Kondo lattices. It is worthwhile to mention that the coexistence of ferromagnetic order and Kondo effect is most frequently found in Ce-based, [5][6][7][8][9][10][11] or U-based systems, [12][13][14][15][16] but much rarer in Npcompounds, since only two compounds NpNiSi 2 , [17] and Np 2 PdGa 3 , [4] were reported so far. Moreover, it seems that there should be different approaches to ferromagnetic Kondo problems as regards to particular values of spin angular momentum S of systems.…”

Section: Introductionmentioning

confidence: 99%

Ferromagnetic behavior of the Kondo lattice compound $Np_2PtGa_3$

Tran,

Griveau,

Eloirdi

et al. 2014

Preprint

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In this study we report the results of study of novel ternary Np2PtGa3 compound. The x-raypowder diffraction analysis reveals that the compound crystallizes in the orthorhombic CeCu2-type crystal structure (space group Imma) with lattice parameters a = 0.4409(2) nm, b = 0.7077(3) nm and c = 0.7683(3) nm at room temperature. The measurements of dc magnetization, specific heat and electron transport properties in the temperature range 1.7 -300 K and in magnetic fields up to 9 T imply that this intermetallic compound belongs to a class of ferromagnetic Kondo systems. The Curie temperature of TC ∼ 26 K is determined from the magnetization and specific heat data. An enhanced coefficient of the electronic specific heat of γ = 180 mJ/(mol at. Np K 2 ) and -lnT dependence of the electrical resistivity indicate the presence of Kondo effect, which can be described in terms of the S = 1 underscreened Kondo-lattice model. The estimated Kondo temperature TK ∼ 24 K, Hall mobility of ∼ 16.8 cm 2 /Vs and effective mass of ∼ 83 me are consistent with assumption that the heavy-fermion state develops in Np2PtGa3 at low temperatures. We compare the observed properties of Np2PtGa3 to that found in Np2PdGa3 and discuss their difference in regard to change in the exchange interaction between the conduction and localized 5f electrons. We have used the Fermi wave vector kF to evaluate the Rudermann-Kittel-Kasuya-Yosida (RKKY) exchange. Based on experimental data of the (U, Np)2(Pd, Pt)Ga3 compounds we suggest that the evolution of the magnetic ground states in these actinide compounds can be explained within the RKKY formalism.

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Kondo-like behavior in ThAsSe and UAsSe

Cited by 7 publications

References 8 publications

Coexistence of ferromagnetism and Kondo effect in the underscreened Kondo lattice

Coexistence of ferromagnetism and Kondo effect in the underscreened Kondo lattice

CeAsSeSynthesis, Crystal Structure, and Physical Properties

Ferromagnetic behavior of the Kondo lattice compound $Np_2PtGa_3$

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