Mo6Ga31 endohedral cluster superconductor

Verchenko, Valeriy Yu.; Zubtsovskii, Alexander O.; Tsirlin, Alexander A.; Wei, Zheng; Roslova, Maria; Dikarev, Evgeny V.; Shevelkov, Аndrei V.

doi:10.1016/j.jallcom.2020.156400

Cited by 12 publications

(7 citation statements)

References 23 publications

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“…4.6 Å; thus, direct Pd–Pd bonding is negligible. Such a situation is also found in other endohedral Ga cluster superconductors, such as Mo 8 Ga 41 , ,,, Mo 6 Ga 31 , , Mo 4 Ga 21 , , and TM 2 Ga 9 families. However in ReGa 5 , the Re–Re distance is clearly within the direct bonding range.…”

Section: Introductionsupporting

confidence: 60%

“…Endohedral Ga cluster compounds constitute a family of superconductors that recently gained increased attention. − While crystal structures found in the TM x Ga y (TM, transition metal) compounds are diverse and rather complex, they can be conveniently described as networks of interconnected endohedral Ga clusters. Xie et al .…”

Section: Introductionmentioning

confidence: 99%

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Superconductivity in the Endohedral Ga Cluster Compound PdGa₅

et al. 2021

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Superconductivity is observed below T c = 1.6 K in an endohedral Ga cluster compound PdGa5 using magnetization and heat capacity measurements. Electronic structure calculations show that the density of states (DOS) at the Fermi level is dominated by Ga s and p states and that the overall shape of DOS is similar to what was found in other endohedral Ga cluster superconductors, such as Mo x Ga5x+1, ReGa5, and T 2Ga9 (T = Rh and Ir). Our results provide a more complete picture of the relationship between the valence electron count and superconductivity in the family of endohedral Ga cluster superconductors.

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Section: Introductionsupporting

confidence: 60%

Section: Introductionmentioning

confidence: 99%

Superconductivity in the Endohedral Ga Cluster Compound PdGa₅

et al. 2021

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“…This enhancement is in line with the increased value of α seen in the electronic specific heat and may be due to the increased role of the electron–phonon coupling. Strong electron–phonon coupling in the superconducting state was reported for Mo 4 Ga 21– x –δ Sn x with T c = 5.85 K, Mo 6 Ga 31 (8.2 K)-, and Mo 8 Ga 41 (9.8 K)-related superconductors.…”

mentioning

confidence: 95%

“…Semiconducting properties at the particular values of VEC are associated with the stable electronic configurations, such as an 8-electron configuration in the main group MgAgAs-type compounds and an 18-electron configuration in the transition-metal-based intermetallics. − At the same time, superconductivity is usually found in the metallic state with the increased number of valence electrons, when the Fermi level is shifted to the conduction band and high density of states is realized at the Fermi energy. This scheme was proposed to describe the physical properties of the endohedral Ga cluster compounds, where a number of superconductors, including Mo 8 Ga 41 , , Mo 6 Ga 31 , , ReGa 5 , Rh 2 Ga 9 , and Ir 2 Ga 9 , exhibit a peculiar dependence of the critical temperature on the valence electron count.…”

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confidence: 99%

Family of Mo₄Ga₂₁-Based Superconductors

et al. 2020

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Endohedral cluster superconductors are an emerging field, where simple electron counting rules govern the phase stability and transition temperature. Nontrivial microscopic properties of the superconducting state, including strong electron–phonon coupling and multigap superconductivity, raise fundamental interest in studying these materials. Herein, Mo4Ga20.38(1)S0.62(1), Mo4Ga20Se, Mo4Ga20Te, and Mo4Ga20Sb endohedral cluster compounds were synthesized in the form of bulk polycrystalline samples and single crystals. Together with the recently reported Mo4Ga21–x–δSn x , these compounds belong to the new Mo4Ga21 structure type with notable functionality: all the discovered representatives show superconducting properties. The observed critical temperatures of 5.1, 3.3, 4.6, and 6.6 K for the S-, Se-, Te-, and Sb-containing compounds, respectively, correlate well with the experimental values of the Sommerfeld coefficient. An emerging role of the electron–phonon coupling may be responsible for the enhancement of critical temperature in the case of Mo4Ga20Sb.

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“…When several main-group elements are combined in one endohedral cluster framework, new compounds can be synthesized, and even unknown structure types can be discovered. For example, two endohedral gallium cluster superconductors, Mo 8 Ga 41 and Mo 6 Ga 31 , are known in the Mo–Ga binary system, while the combination of gallium and zinc expands the family of superconductors due to the formation of the Mo 8 Ga 41– x Zn x solid solution. Furthermore, the Mo 7 Ga 52– x Zn x ternary compound with a quasicrystal approximant endohedral cluster framework and surprisingly narrow homogeneity range was discovered in the Mo–Ga–Zn ternary system .…”

Section: Introductionmentioning

confidence: 99%

Intermetallic Compound Re₂Ga₉Ge with Re- and Ge-Embedded Gallium Clusters: Synthesis, Crystal Structure, Chemical Bonding, and Physical Properties

et al. 2021

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Transition metal-based endohedral cluster intermetallic compounds are interesting electron phases, which frequently exhibit superconductivity with a peculiar interplay between the critical temperature and valence electron count. We present a new Re-based endohedral gallium cluster compound, Re2Ga9Ge. Its unique crystal structure (P42 /mmc space group, a = 8.0452(3) Å, c = 6.7132(2) Å) is built by two types of gallium polyhedra: monocapped Archimedean antiprisms centered by rhenium atoms and tetrahedra containing a main-group element inside. The analysis of chemical bonding shows the presence of localized pairwise interactions between the p-block elements and the formation of multicenter bonds with the participation of d-orbitals of rhenium. In the electronic band structure, the Fermi level is located in a narrow pseudogap indicating the optimum band filling and thus explaining the virtual absence of a homogeneity range. The compound exhibits Pauli paramagnetism and metallic properties with unexpectedly low thermal conductivity. A sharp anomaly observed on the magnetic susceptibility and resistivity curves presumably indicates the electronic phase transition accompanied by charge ordering at the characteristic temperature of T * = 271 K in zero magnetic field.

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Mo6Ga31 endohedral cluster superconductor

Cited by 12 publications

References 23 publications

Superconductivity in the Endohedral Ga Cluster Compound PdGa₅

Superconductivity in the Endohedral Ga Cluster Compound PdGa₅

Family of Mo₄Ga₂₁-Based Superconductors

Intermetallic Compound Re₂Ga₉Ge with Re- and Ge-Embedded Gallium Clusters: Synthesis, Crystal Structure, Chemical Bonding, and Physical Properties

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Mo6Ga31 endohedral cluster superconductor

Cited by 12 publications

References 23 publications

Superconductivity in the Endohedral Ga Cluster Compound PdGa5

Superconductivity in the Endohedral Ga Cluster Compound PdGa5

Family of Mo4Ga21-Based Superconductors

Intermetallic Compound Re2Ga9Ge with Re- and Ge-Embedded Gallium Clusters: Synthesis, Crystal Structure, Chemical Bonding, and Physical Properties

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Product

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About

Superconductivity in the Endohedral Ga Cluster Compound PdGa₅

Superconductivity in the Endohedral Ga Cluster Compound PdGa₅

Family of Mo₄Ga₂₁-Based Superconductors

Intermetallic Compound Re₂Ga₉Ge with Re- and Ge-Embedded Gallium Clusters: Synthesis, Crystal Structure, Chemical Bonding, and Physical Properties