La3Ru8B6 and Y3Os8B6, new members of a homologous series R(A)nM3n−1B2n

Sologub, O.; Salamakha, Leonid; Noël, H.; Roisnel, Thierry; Gonçalves, A.P.

doi:10.1016/j.jssc.2007.02.019

Cited by 9 publications

(15 citation statements)

References 16 publications

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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.…”

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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%

“…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]. On the other hand, the structures of La 2 Ru 5 B 4 and La 3 Ru 8 B 6 as shown in fig.…”

mentioning

confidence: 97%

“…On the other hand, the structures of La 2 Ru 5 B 4 and La 3 Ru 8 B 6 as shown in fig. 1(b) and (c) represent the intergrowth of CeAl 2 Ga 2 -type LaRu 2 B 2 and CeCo 3 B 2 -type LaRu 3 B 2 structural fragments along c axis, taken in ration 1 : 1 and 1 : 2, respectively [15]. The formula for the series can be expressed by La n Ru 3n−1 B 2n = LaRu 2 B 2 + (n − 1)LaRu 3 B 2 .…”

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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: 92%

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confidence: 66%

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confidence: 97%

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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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“…All these structures can be visualized as a sequence of stacked layers: taking AM 3 B 2 as a reference, the M-layers of AM 2 B 2 contain only 2/3 of the M atoms and are shifted by b /2 along the y -direction. On the other hand, the structure of A 3 M 8 B 6 , (AM 3− δ B 2 , δ = 1/3) can be visualized as a stacking of the structural fragments of AM 3 B 2 (AM 3− δ B 2 , δ = 0) and AM 2 B 2 (AM 3− δ B 2 , δ = 1); there are six Rh layers in the unit cell of A 3 M 8 B 6 but only two of these exhibit 1/3 vacant Rh-sites (for further structure details see [3, 4]).…”

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Probing the electronic properties of ternary A_nM_3n−1B_2n(n= 1: A = Ca, Sr; M = Rh, Ir andn= 3: A = Ca, Sr; M = Rh) phases: observation of superconductivity

Takeya

ElMassalami

Terrazos

et al. 2013

Science and Technology of Advanced Materials

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We follow the evolution of the electronic properties of the titled homologous series when n as well as the atomic type of A and M are varied where for n = 1, A = Ca, Sr and M = Rh, Ir while for n = 3, A = Ca, Sr and M = Rh. The crystal structure of n = 1 members is known to be CaRh2B2-type (Fddd), while that of n = 3 is Ca3Rh8B6-type (Fmmm); the latter can be visualized as a stacking of structural fragments from AM3B2 (P6/mmm) and AM2B2. The metallic properties of the n = 1 and 3 members are distinctly different: on the one hand, the n = 1 members are characterized by a linear coefficient of the electronic specific heat γ ≈ 3 mJ mol−1 K−2, a Debye temperature θD ≈ 300 K, a normal conductivity down to 2 K and a relatively strong linear magnetoresistivity for fields up to 150 kOe. The n = 3 family, on the other hand, exhibits γ ≈ 18 mJ mol−1 K−2, θD ≈ 330 K, a weak linear magnetoresistivity and an onset of superconductivity (for Ca3Rh8B6, Tc = 4.0 K and Hc2 = 14.5 kOe, while for Sr3Rh8 B6, Tc = 3.4 K and Hc2 ≈ 4.0 kOe). These remarkable differences are consistent with the findings of the electronic band structures and density of state (DOS) calculations. In particular, satisfactory agreement between the measured and calculated γ was obtained. Furthermore, the Fermi level, EF, of Ca3Rh8B6 lies at almost the top of a pronounced local DOS peak, while that of CaRh2B2 lies at a local valley: this is the main reason behind the differences between the, e.g., superconducting properties. Finally, although all atoms contribute to the DOS at EF, the contribution of the Rh atoms is the strongest.

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ChemInform Abstract: La₃Ru₈B₆ and Y₃Os₈B₆, New Members of a Homologous Series R(A)_nM_3n‐1B_2n.

Sologub¹,

Salamakha²,

Noël

et al. 2008

ChemInform

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Structure D 2000La3Ru8B6 and Y3Os8B6, New Members of a Homologous Series R(A)nM3n-1B2n. -The structures of the two new title compounds, prepared by arc-melting of the elements, are determined by single crystal XRD. The compounds crystallize isotypically in the space group Fmmm with Z = 4. Their structures are built up from CeCo3B2-type and CeAl2Ga2-type structural fragments in the ratio of 2:1. The structure of La0.94Ru3B2 is refined by the Rietveld method from powder XRD data. This compound crystallizes in the space group P6/mmm. -(SOLOGUB*, O. L.; SALAMAKHA, L. P.; NOEL, H.; ROISNEL, T.; GONCALVES, A. P.; J. Solid State

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La3Ru8B6 and Y3Os8B6, new members of a homologous series R(A)nM3n−1B2n

Cited by 9 publications

References 16 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)

Probing the electronic properties of ternary A_nM_3n−1B_2n(n= 1: A = Ca, Sr; M = Rh, Ir andn= 3: A = Ca, Sr; M = Rh) phases: observation of superconductivity

ChemInform Abstract: La₃Ru₈B₆ and Y₃Os₈B₆, New Members of a Homologous Series R(A)_nM_3n‐1B_2n.

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La3Ru8B6 and Y3Os8B6, new members of a homologous series R(A)nM3n−1B2n

Cited by 9 publications

References 16 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)

Probing the electronic properties of ternary AnM3n−1B2n(n= 1: A = Ca, Sr; M = Rh, Ir andn= 3: A = Ca, Sr; M = Rh) phases: observation of superconductivity

ChemInform Abstract: La3Ru8B6 and Y3Os8B6, New Members of a Homologous Series R(A)nM3n‐1B2n.

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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)

Probing the electronic properties of ternary A_nM_3n−1B_2n(n= 1: A = Ca, Sr; M = Rh, Ir andn= 3: A = Ca, Sr; M = Rh) phases: observation of superconductivity

ChemInform Abstract: La₃Ru₈B₆ and Y₃Os₈B₆, New Members of a Homologous Series R(A)_nM_3n‐1B_2n.