Magnetic, transport, and thermal properties of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msub><mml:mrow><mml:mi mathvariant="normal">Yb</mml:mi></mml:mrow><mml:mrow><mml:mn>2</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>T</mml:mi></mml:mrow><mml:mrow><mml:mn>3</mml:mn></mml:mrow></mml:msub></mml:mrow><mml:mrow><mml:msub><mml:mrow><mml:mi>X</mml:mi></mml:mrow><mml:mrow><mml:mn>9</mml:mn></mml:mrow></mml:msub></mml:mrow></mml:mat

Trovarelli, O.; Geibel, C.; Buschinger, B.; Borth, R.; Mederle, S.; Grosche, Malte; Sparn, G.; Steglich, F.; Brosch, O.; Donnevert, L.

doi:10.1103/physrevb.60.1136

Cited by 34 publications

(28 citation statements)

References 29 publications

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“…Examination of the resulting lattice parameters suggests that the hexagonal unit cell is apparently a subcell of a larger orthorhombic cell (with a orthorhombic √ 3a hexagonal ). The room-temperature values of the hexagonal lattice parameters are a = 7.471 (6) A, c = 9.440(3)Å for Yb 2 Rh 3 Ga 9 and a = 7.483(4) A, c=9.441(2)Å for Yb 2 Ir 3 Ga 9 , in agreement with Ref. [6,11].…”

Section: Methodssupporting

confidence: 82%

“…The maxima in χ(T ) are shifted to higher temperature, and Curie-Weiss behavior is not fully recovered by our highest measurement temperature. As pointed out by Trovarelli et al, 6 the upturns in susceptibility at lowest temperature may not be extrinsic. These authors reach this conclusion based on field-dependent magnetization measurements.…”

Section: Methodsmentioning

confidence: 71%

“…The room-temperature values of the hexagonal lattice parameters are a = 7.471 (6) A, c = 9.440(3)Å for Yb 2 Rh 3 Ga 9 and a = 7.483(4) A, c=9.441(2)Å for Yb 2 Ir 3 Ga 9 , in agreement with Ref. [6,11]. The larger orthorhombic lattice constants are close to those reported for polycrystalline samples of the same compounds obtained by means of arc-or induction-melting.…”

Section: Methodsmentioning

confidence: 99%

“…That we see field-orientation dependent upturns at low temperature, especially in the case of Yb 2 Rh 3 Ga 9 [χ(T ) for H c is essentially temperature independent whereas χ(T ) for H ⊥ c increases rapidly with decreasing temperature] adds further credibility to this assertion. 6 The electrical resistivity ρ(T ), measured with current applied along the hexagonal c-axis (the long axis of our rod-like crystals), of Yb 2 Rh 3 Ga 9 and Yb 2 Ir 3 Ga 9 is displayed in the left insets of Fig. 1 and Fig.…”

Section: Methodsmentioning

confidence: 99%

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Crystal-field effects in the mixed-valence compoundsYb2M3Ga9(M=

et al. 2005

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Magnetic susceptibility, heat capacity, and electrical resistivity measurements have been carried out on single crystals of the intermediate valence compounds Yb2Rh3Ga9 and Yb2Ir3Ga9. These measurements reveal a large anisotropy due apparently to an interplay between crystalline electric field (CEF) and Kondo effects. The temperature dependence of magnetic susceptibility can be modelled using the Anderson impurity model including CEF within an approach based on the NonCrossing Approximation.PACS numbers: 75.30.Mb,75.20.Hr,71.27.+a,71.28.+d The intermediate valence compounds pose one of the most challenging problems of strongly correlated electron systems. Different ingredients contribute to the complexity of these fascinating systems: the presence of strong Kondo interactions, the level structure of the crystal electric field (CEF) f -orbitals, the different hybridizations between each level and the conduction band, and the eventual coherence effects and magnetic interactions introduced by the periodicity of the Kondo lattice. 1Strong valence fluctuations are observed in the intermetallic compounds with Ce, Yb and U. In particular, Yb compounds attract a great deal of interest because the trivalent Yb ion is at least in some sense the hole counterpart of the Ce 3+ ion which has one electron in its 4f shell. As in the case of the Ce compounds, 2 the Ybbased intermetallics exhibit a diversity of physical properties that remain to be understood. 3The isostructural series of compounds R 2 M 3 X 9 (R = La, Ce, Yb, U; M=Co, Rh, Ir; X = Al, Ga) exhibit antiferromagnetic ordering for R=Yb, X=Al, and mixedvalence behavior for R=Ce,Yb and X=Ga. 4,5,6,7 All the U-based compounds order antiferromagnetically at temperatures below 40 K.4 The Yb 2 M 3 Ga 9 compounds are a suitable class of materials for studying the difference in the electronic structure between the magnetically ordered Kondo lattice and the mixed-valence systems. The orientation-dependent temperature T max of the maximum in the magnetic susceptibility suggests the possibility of an anisotropic Kondo effect.8,9 Previously, Petrovic et al. studied ternary R-Ir-Ga compounds (R=rare earth) that were assigned the RIr 2 Ga stoichiometry in their work. 10,11,12 Elemental analysis studies unavailable to these previous authors suggest that R 2 Ir 3 Ga 9 is the correct stoichiometry of these materials instead. The R 2 Ir 3 Ga 9 compounds with Ce and Yb show reduced magnetic moments and the absence of magnetic order above 0.04 K. 11The thermodynamic properties of the single-impurity model have been calculated exactly using the Betheansatz technique, 14,15,16,17,18 and also approximately within the Non-Crossing Approximation (NCA), which shows good agreement with the former.19 However, to the best of our knowledge, it has always been assumed that the hybridization V m between any state of the magnetic configuration |m and the conduction electrons is independent of m even when the CEF is included.14,15,16 This is a requirement for the integrability of the problem; 20 a...

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Section: Methodssupporting

confidence: 82%

Section: Methodsmentioning

confidence: 71%

Section: Methodsmentioning

confidence: 99%

Section: Methodsmentioning

confidence: 99%

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Crystal-field effects in the mixed-valence compoundsYb2M3Ga9(M=

et al. 2005

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“…2). Let us assume that Rh(Ir) and Ga are covalently bonded in these crystal structures like it was recently shown for the binary compounds IrGa 2 [27], Rh 3 Ga 16 and Rh 4 Ga 21 [28]. In this case, the lattice parameters a and b are controlled by the layer B containing only gallium and transition metal atoms with short distances of ≈ 2.60Å, comparable with the sum of covalent radii of Rh, Ir and Ga (1.25, 1.27 and 1.25Å, respectively [29]).…”

Section: Structure Chemistrymentioning

confidence: 99%

Crystal Structure and Physical Properties of New Ternary Gallides Eu₂Rh₃Ga₉ and Eu₂Ir₃Ga₉

Sichevych

Schnelle

Prots

et al. 2006

Zeitschrift Für Naturforschung B

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The compounds Eu 2 Rh 3 Ga 9 and Eu 2 Ir 3 Ga 9 were synthesized by melting the elements in sealed tantalum tubes with subsequent annealing at 600 • C. Both gallides are isotypic with Y 2 Co 3 Ga 9 (space group Cmcm, Pearson symbol oC56, Z = 4) as evidenced by single crystal structure analysis: a = 12.9902(6), b = 7.6141(4), c = 9.7433(5)Å, R F = 0.025, 617 structure factors, 42 variable parameters for Eu 2 Rh 3 Ga 9 , and a = 13.0371 (7), b = 7.6017(4), c = 9.6972(6)Å, R F = 0.032, 645 reflections, 42 variables for Eu 2 Ir 3 Ga 9 . Magnetic susceptibility measurements as well as X-ray absorption spectra indicate the 4 f 7 electronic configuration of europium (Eu 2+ ) with significant admixture of the 4 f 6 state in both compounds.

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An Unusual Valence State: Trivalent Europium in Intermetallic Eu₂Ir₃Al₉

Stegemann

Block

Klenner

et al. 2019

Chemistry A European J

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Eu2Ir3Al9, synthesized from the elements in tantalum tubes, is one of the rare examples for trivalent europium in the field of intermetallic compounds. The compound crystallizes in the Y2Co3Ga9‐type structure (space group Cmcm), with lattice parameters fitting in between the isostructural samarium and gadolinium compounds. In the crystal structure, the Eu atoms form Al3‐triangle‐centered honeycomb layers and exhibit a coordination number of 17 in the shape of a fivefold‐capped hexagonal prism (Eu@Ir6Al6+Al5). Magnetic measurements indicate an overall low susceptibility, in line with van Vleck paramagnetism caused by the Eu3+ cations. Fits of the susceptibility yield a coupling constant of λ=290(10) K and an effective magnetic moment of μeff=4.56(1) μB, in line with a slight hybridization of the 7F0 and 7F1 state. 151Eu Mössbauer spectroscopic investigations unambiguously prove the presence of solely Eu3+ in the bulk material.

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Magnetic, transport, and thermal properties ofYb2T3X9

Cited by 34 publications

References 29 publications

Crystal-field effects in the mixed-valence compoundsYb2M3Ga9(M=

Crystal-field effects in the mixed-valence compoundsYb2M3Ga9(M=

Crystal Structure and Physical Properties of New Ternary Gallides Eu₂Rh₃Ga₉ and Eu₂Ir₃Ga₉

An Unusual Valence State: Trivalent Europium in Intermetallic Eu₂Ir₃Al₉

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Magnetic, transport, and thermal properties ofYb2T3X9

Cited by 34 publications

References 29 publications

Crystal-field effects in the mixed-valence compoundsYb2M3Ga9(M=

Crystal-field effects in the mixed-valence compoundsYb2M3Ga9(M=

Crystal Structure and Physical Properties of New Ternary Gallides Eu2Rh3Ga9 and Eu2Ir3Ga9

An Unusual Valence State: Trivalent Europium in Intermetallic Eu2Ir3Al9

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Product

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Crystal Structure and Physical Properties of New Ternary Gallides Eu₂Rh₃Ga₉ and Eu₂Ir₃Ga₉

An Unusual Valence State: Trivalent Europium in Intermetallic Eu₂Ir₃Al₉