The crystal structure of CeRu2B2 and isotypic compounds M(Ru, Os)2B2, M = La, Pr, Nd, Sm, Gd, and Th

Horvath, Christina; Rogl, P.; Hiebl, K.

doi:10.1016/0022-4596(87)90340-9

Cited by 15 publications

(15 citation statements)

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“…The fitted lattice parameters are listed in Table 1. The lattice parameters of LaRu 2 B 2 and La 3 Ru 8 B 6 are consistent with previously reported values [14,15]. As shown in the main panel of fig.…”

supporting

confidence: 92%

“…It is difficult to synthesize singlephase samples and the second phases always exist. This situation has also been pointed out in the literature when preparing A n M 3n−1 B 2n (A = La, Y, Ca, and Sr, M = Ru, Os, and Rh) [6,14,15]. The existence of minor second phase with lower n suggests that these homologous compounds might compete each other in the phase space.…”

supporting

confidence: 66%

“…For LaRu 2 B 2 , 1/3 of Ru atoms are removed in the puckered Ru Kogamé layers when compared to CeCo 3 B 2 -type compounds, forming Ru chains in ab-plane. Along the c-axial direction, the layers are shifted b/2 from each other [14]. Moreover, in contrast to CaRh 2 B 2 with space group Fddd, the rather small symmetry deviations in LaRu 2 B 2 lower the space group to the noncentrosymmetric crystallographic subgroup F222 [14].…”

mentioning

confidence: 93%

“…Along the c-axial direction, the layers are shifted b/2 from each other [14]. Moreover, in contrast to CaRh 2 B 2 with space group Fddd, the rather small symmetry deviations in LaRu 2 B 2 lower the space group to the noncentrosymmetric crystallographic subgroup F222 [14]. LaRu 2 B 2 can also be viewed as the stacking variants of CeAl 2 Ga 2 type [15].…”

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confidence: 99%

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Superconductivity and physical properties of strongly electron correlated compounds La _n Ru _3n−1 B _2n (n = 1, 2, and 3)

Lei¹,

Hosono²

2013

EPL

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-We examined the physical properties of homologous LanRu3n−1B2n (n = 1 − 3) series including a new compound of n = 2. All of these compounds showed strong electron-electron correlation characterized by large Wilson ratio. In contrast to LaRu2B2 and La2Ru5B4 that show normal metal behaviors down to 1.8 K, we discover La3Ru8B6 is an intermediately coupled BCS superconductor with Tc ∼ 3.2 K. The experimental and theoretical calculation results suggest that the emergence of superconductivity in La3Ru8B6 attributes to the rather large density of states at EF when compared to other two compounds.Introduction. -Ternary boride superconductors with VIIIB precious metals (Ru, Rh, Pd, Os, Ir, Pt) have been studied for a long time because of their various exotic properties. For example, noncentrosymmetric Li 2 Pt 3 B with strong antisymmetric spin-orbit coupling exhibits the mixing of spin-singlet and spin-triplet pairings, when compared to the BCS s-wave superconductor Li 2 Pd 3 B [1-3]. Another series compounds RERh 4 B 4 (RE = rare earth elements) show the coexistence of long-range ferromagnetic (FM) order and superconductivity, which has been extensively studied over the past 30 years [4,5].Recently, superconductivity is discovered in A 3 Rh 8 B 6 (A = Ca, Sr) compounds [6]. They belong to a homologous series A n Rh 3n−1 B 2n [7]. The measurements of physical properties indicate that Ca 3 Rh 8 B 6 and Sr 3 Rh 8 B 6 are superconductors with T c = 4.0 and 3.4 K, respectively, however, AM 2 B 2 (n = 1, M = Rh, Ir) do not show superconductivity for T > 1.8 K [6]. The experimental and theoretical calculation results suggest that the main reason of the emergence of superconductivity in A 3 Rh 8 B 6 should be due to the large N (E F ) (density of states (DOS) at fermi energy level, E F ) [6]. On other hand, isostructural compound Y 3 Os 8 B 6 also shows superconductivity with T c = 5.8 K [8]. Therefore, it is interesting to study the physical properties of other isostructural compounds.We notice that the similar homologous series exists in

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confidence: 66%

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confidence: 93%

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Superconductivity and physical properties of strongly electron correlated compounds La _n Ru _3n−1 B _2n (n = 1, 2, and 3)

Lei¹,

Hosono²

2013

EPL

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“…Besides the prototype only the borides RIr 2 B 2 (R = Ca, Sr, Y, La-Nd, Sm-Dy), [46][47][48] SrRh 2 B 2 , [46] and the germanide BaRu 2 Ge 2 [49] were reported. This structure type has a quite www.zaac.wiley-vch.de [50] however, with the translationengleiche subgroup F222 and a splitting of all crystallographic sites. The ruthenium and boron sites of CeRu 2 B 2 show small dislocations off the ideal positions.…”

Section: Crystal Chemistrymentioning

confidence: 98%

The Gallides SrRh₂Ga₂, SrIr₂Ga₂, and Sr₃Ir₄Ga₄

Seidel

Schubert

Hoffmann

et al. 2015

Zeitschrift anorg allge chemie

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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) ˚ A, 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) ˚ A, 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 ad-mixture of the 4 f 6 state in both compounds.

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Substitutional Metal Borides

Rogl¹

1991

Inorganic Reactions and Methods

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The crystal structure of CeRu2B2 and isotypic compounds M(Ru, Os)2B2, M = La, Pr, Nd, Sm, Gd, and Th

Cited by 15 publications

References 11 publications

Superconductivity and physical properties of strongly electron correlated compounds La _n Ru _3n−1 B _2n (n = 1, 2, and 3)

Superconductivity and physical properties of strongly electron correlated compounds La _n Ru _3n−1 B _2n (n = 1, 2, and 3)

The Gallides SrRh₂Ga₂, SrIr₂Ga₂, and Sr₃Ir₄Ga₄

Substitutional Metal Borides

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The crystal structure of CeRu2B2 and isotypic compounds M(Ru, Os)2B2, M = La, Pr, Nd, Sm, Gd, and Th

Cited by 15 publications

References 11 publications

Superconductivity and physical properties of strongly electron correlated compounds La n Ru 3n−1 B 2n (n = 1, 2, and 3)

Superconductivity and physical properties of strongly electron correlated compounds La n Ru 3n−1 B 2n (n = 1, 2, and 3)

The Gallides SrRh2Ga2, SrIr2Ga2, and Sr3Ir4Ga4

Substitutional Metal Borides

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Superconductivity and physical properties of strongly electron correlated compounds La _n Ru _3n−1 B _2n (n = 1, 2, and 3)

Superconductivity and physical properties of strongly electron correlated compounds La _n Ru _3n−1 B _2n (n = 1, 2, and 3)

The Gallides SrRh₂Ga₂, SrIr₂Ga₂, and Sr₃Ir₄Ga₄