Superconductivity of ZrRuSi prepared at high pressure

Shirotani, Ichimin; Tachi, Kenji; Takeda, Keiki; Todo, Synge; Yagi, T.; Kanoda, K.

doi:10.1103/physrevb.52.6197

Cited by 43 publications

(41 citation statements)

References 6 publications

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“…It has been speculated that the two-dimensional planar framework of T and TЈ in the TTЈP type structure may play an important role in the superconducting properties. [12][13][14][15][16] As will be shown later, a more detailed explanation must be based on accurate quantummechanical calculations of the electronic structure of these crystals.…”

Section: B X-ray Rietveld Refinementsmentioning

confidence: 99%

“…In recent years, the phosphides and silicides received increased attention because of the interesting superconductivity properties. [12][13][14][15][16][17][18] There are two structure types for TTЈX, both of which are layer structures. The first structure type is hexagonal P6 m2 (Fe 2 [1][2][3][4][5][6][7] The second structure type is referred to as the anti-PbCl 2 type ͑or Co 2 Si), which has the orthorhombic space group Pnma.…”

Section: Introductionmentioning

confidence: 99%

“…Examples are TiRuP, TiPdSi, MnRhSi, ZrFeGe, ZrRhGe, and NbRhGe. 4,[11][12][13][14][15] The orthorhombic phase transforms to the higher-symmetry hexagonal form at high temperatures and pressures. 8 We will refer these two phases as o-TTЈX and h-TTЈX, respectively.…”

Section: Introductionmentioning

confidence: 99%

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Structure and electronic properties of the orthorhombic MoRuP superconductor prepared at high pressure

Wong‐Ng

Ching

et al. 2003

Phys. Rev. B

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The orthorhombic superconductor MoRuP (o-MoRuP) was prepared under high pressure, and its structure was refined using the x-ray Rietveld technique. The grayish-black sample of o-MoRuP is a superconductor with T c ϭ15.5 K and having space group Pnma and lattice parameters aϭ6.03503(16) Å, b ϭ3.85311(8) Å, and cϭ6.94355(17) Å, Vϭ161.463(7) Å. 3 The structure of o-MoRuP is characterized by layers ͑parallel to the ac plane͒ of Mo, Ru, and P atoms. Based on the accurately determined crystal structure, the band structure and the density of states ͑DOS͒ of o-MoRuP were calculated by a first-principles densityfunctional method and compared with those of the isostructural superconductor o-ZrRuP (T c ϭ4 K). It is shown that the high T c in o-MoRuP is directly related to the higher level of the DOS at the Fermi level (E F ) and is traced to be predominantly from the Mo 4d orbitals. The calculated values of the DOS at E F are 0.46 and 0.33 states/eV atom for the Mo and Zr analogs, respectively. The electronic bonding in these two crystals is analyzed in terms of the Mulliken effective charge and the bond order values. The bonding in o-MoRuP differs from that in o-ZrRuP in that there is a short ͑2.44 Å͒ Mo-P bond. The x-ray reference pattern of o-MoRuP prepared using a Rietveld decomposition technique has been submitted to the International Center for Diffraction Data to be included in the Powder Diffraction File.

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Section: B X-ray Rietveld Refinementsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Structure and electronic properties of the orthorhombic MoRuP superconductor prepared at high pressure

Wong‐Ng

Ching

et al. 2003

Phys. Rev. B

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“…ScRuSi is an analog to ZrRuSi which is a superconductor with a moderate T c = 12 K [7]. It was first discovered as the hexagonal Fe 2 P-type in 1982 [22].…”

Section: Introductionmentioning

confidence: 99%

Superconductivity at 3.1 K in the orthorhombic ternary silicide ScRuSi

Ruan

Wang

Jia

et al. 2016

Supercond. Sci. Technol.

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Abstract:We report the synthesis, crystal structure, superconductivity and physical property characterizations of the ternary equiatomic compound ScRuSi. Polycrystalline samples of ScRuSi were prepared by an arc-melting method. The as-prepared samples were identified as the orthorhombic Co 2 P-type o-ScRuSi by the powder X-ray diffraction analysis. Electrical resistivity measurement shows o-ScRuSi to be a metal which superconducts below a T c of 3.1 K, and the upper critical field μ 0 H c2 (0) is estimated to be 0.87 T. The magnetization and specific heat measurements confirm the bulk type-II superconductivity in o-ScRuSi, with the specific heat jump within the BCS weak coupling limit. o-ScRuSi is the first Co 2 P-type superconductor containing scandium.After annealing at 1273 K for a week, o-ScRuSi transforms into the hexagonal Fe 2 P-type h-ScRuSi, and the latter is a Pauli-paramagnetic metal with no superconductivity observed above 1.8 K.2

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“…An ambient phase of ZrRuSi synthesized by arc-melting has been reported to show no superconductivity down to 1.2 K [11,12], while that synthesized at a high pressure shows it with T c of 7-12 K [13], although it is isostructural to the ambient phase. Additionally, another high-pressure phase of ZrRuSi has been reported to be a superconductor with T c of 3-5 K [13]. As for Zr 2 Ru 3 Si 4 , superconductivity with T c of 5.6 K was originally reported in a half page of abstract for a presentation by H. F. Braun et al in 1986 [14,15], but no detail has been reported so far.…”

Section: Introductionmentioning

confidence: 99%

Superconducting properties of the ternary transition-metal silicide Zr₂Ru₃Si₄

Ibuka¹,

Imai²,

Naka³

et al. 2014

Supercond. Sci. Technol.

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Superconducting properties of the polycrystalline Zr 2 Ru 3 Si 4 were investigated by measuring the electrical resistivity, magnetization and specific heat. By these measurements, bulk superconductivity with transition temperature T c = 5.5 K was confirmed. Moreover, Zr 2 Ru 3 Si 4 was found to be a type-II and intermediate-coupling superconductor. Interestingly, the electronic specific heat shows a deviation from a one-gap s-wave model and H c2 (T) shows unusual positive curvature in the vicinity of T c . The electronic structure calculation shows the existence of plural anisotropic Fermi surfaces. These results suggest that Zr 2 Ru 3 Si 4 is not an isotropic single-gap superconductor, but possibly a multi-gap or an anisotropic gap superconductor.

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Superconductivity of ZrRuSi prepared at high pressure

Cited by 43 publications

References 6 publications

Structure and electronic properties of the orthorhombic MoRuP superconductor prepared at high pressure

Structure and electronic properties of the orthorhombic MoRuP superconductor prepared at high pressure

Superconductivity at 3.1 K in the orthorhombic ternary silicide ScRuSi

Superconducting properties of the ternary transition-metal silicide Zr₂Ru₃Si₄

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Superconductivity of ZrRuSi prepared at high pressure

Cited by 43 publications

References 6 publications

Structure and electronic properties of the orthorhombic MoRuP superconductor prepared at high pressure

Structure and electronic properties of the orthorhombic MoRuP superconductor prepared at high pressure

Superconductivity at 3.1 K in the orthorhombic ternary silicide ScRuSi

Superconducting properties of the ternary transition-metal silicide Zr2Ru3Si4

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Superconducting properties of the ternary transition-metal silicide Zr₂Ru₃Si₄