Superconductivity in W5SiB2 with the T2 Phase Structure

Fukuma, M.; Kawashima, Kenji; Maruyama, Masaki; Akimitsu, Jun

doi:10.1143/jpsj.80.024702

Cited by 23 publications

(24 citation statements)

References 26 publications

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“…The resistivity varies like T 2.4 above T c up to about 60 K. Above about 100 K, ρ(T ) displays a negative curvature rather than the linear behavior expected for most metals. The normal state temperature dependence is similar to that reported for Mo 5 SiB 2 [9] and W 5 SiB 2 [10], and the negative curvature at higher temperatures has been observed as a common feature in a variety of chemically related compounds, based on Mo 5 X 3 (x = Si, B, C) [26]. This behavior is also seen in the A15-type superconductors, where Fisk and Webb concluded that resistivity saturation results from the approach to the Mott-Ioffe-Regel limit [27].…”

Section: Resultssupporting

confidence: 85%

“…From this data, an upper critical field H c2 (0) of ≈17 kOe can be estimated. This is significantly larger than in the closely related superconductors Mo 5 SiB 2 and W 5 SiB 2 , for which val- ues of 6 kOe and 5 kOe, respectively, are reported [9,10]. Nearly linear behavior, with a slight positive curvature near H = 0, is observed up to fields of 12.5 kOe in Figure 3.…”

Section: Resultsmentioning

confidence: 74%

“…Further experimental analysis presented here will focus primarily on the Mo 5 P 1.1 B 1.9 sample. The T c values seen in these materials are the highest yet reported in this class of ternary superconductors, which include Mo 5 SiB 2 (T c = 5.8 K) [9], Nb 5 SiB 2 (T c = 7.2 K) [9], W 5 SiB 2 (T c = 5.8 K) [10], W 5−x Ta x SiB 2 (T c = 6.5 K) [25], and the closely related Nb 5 Si 2.4 B 0.6 (T c = 7.8 K) [22]. Figure 2 shows the results of magnetization measurements on Mo 5 P 1.1 B 1.9 .…”

Section: Resultsmentioning

confidence: 81%

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Superconductivity at 9 K inMo5PB2with evidence for multiple gaps

McGuire

Parker

2016

Phys. Rev. B

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Superconductivity is observed with critical temperatures near 9 K in the tetragonal compound Mo5PB2. This material adopts the Cr5B3 structure type common to supercondcuting Nb5Si3−xBx, Mo5SiB2, and W5SiB2, which have critical temperatures of 5.8−7.8 K. We have synthesized polycrystalline samples of the compound, made measurements of electrical resistivity, magnetic susceptibility, and heat capacity, and performed first principles electronic structure calculations. The highest Tc value (9.2 K) occurs in slightly phosphorus rich samples, with composition near Mo5P1.1B1.9, and the upper critical field Hc2 at T = 0 is estimated to be ≈ 17 kOe. Together, the measurements and band structure calculations indicate intermediate coupling (λ = 1.0), phonon mediated superconductivity. The temperature dependence of the heat capacity and upper critical field Hc2 below Tc suggest multiple superconducting gaps may be present.

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Section: Resultssupporting

confidence: 85%

Section: Resultsmentioning

confidence: 74%

Section: Resultsmentioning

confidence: 81%

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Superconductivity at 9 K inMo5PB2with evidence for multiple gaps

McGuire

Parker

2016

Phys. Rev. B

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“…The results of firstprinciples calculations of structural properties together with their available theoretical and experimental values [1,2] are presented in Table 1. Our calculated values of lattice constants and volume are in excellent agreement with experimental values [12] indicating high level of reliability of the computational methodology employed.…”

Section: Structural Propertiessupporting

confidence: 73%

“…The experimental and theoretical results simultaneously indicate Mo 5 PB 2 to be a multiband superconductor like the widely studied high-T c compound MgB 2 [9,10]. According to electrical resistivity measurements under various applied magnetic fields, the upper critical field of Mo 5 PB 2 is µ 0 H c2 ∼1.7 Tesla, which is much higher than that of Mo 5 SiB 2 (0.6 Tesla) or W 5 SiB 2 (0.5 Tesla) [11,12]; the other superconductors in the family.…”

Section: Introductionmentioning

confidence: 92%

A comprehensive DFT based insights into the physical properties of tetragonal superconducting Mo5PB2

2021

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Electronic structure, bonding characteristics, and mechanical behaviors of a new family of Si-containing damage-tolerant MAB phases M5SiB2 (M = IVB—VIB transition metals)

Zhang²,

Zhou³

2022

J Adv Ceram

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MAB phases are layered ternary compounds with alternative stacking of transition metal boride layers and group A element layers. Until now, most of the investigated MAB phases are concentrated on compounds with Al as the A element layers. In this work, the family of M5SiB2 (M = IVB—VIB transition metals) compounds with silicon as interlayers were investigated by density functional theory (DFT) methods as potential MAB phases for high-temperature applications. Starting from the known Mo5SiB2, the electronic structure, bonding characteristics, and mechanical behaviors were systematically investigated and discussed. Although the composition of M5SiB2 does not follow the general formula of experimentally reported (MB)2zAx(MB2)y (z = 1, 2; x = 1, 2; y = 0, 1, 2), their layered structure and anisotropic bonding characteristics are similar to other known MAB phases, which justifies their classification as new members of this material class. As a result of the higher bulk modulus and lower shear modulus, Mo5SiB2 has a Pugh’s ratio of 0.53, which is much lower than the common MAB phases. It was found that the stability and mechanical properties of M5SiB2 compounds depend on their valence electron concentrations (VECs), and an optimum VEC exists as the criteria for stability. The hypothesized Zr and Hf containing compounds, i.e., Zr5SiB2 and Hf5SiB2, which are more interesting in terms of high-temperature oxidation/ablation resistance, were found to be unfortunately unstable. To cope with this problem, a new stable solid solution (Zr0.6Mo0.4)5SiB2 was designed based on VEC tuning to demonstrate a promising approach for developing new MAB phases with desirable compositions.

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Superconductivity in W₅SiB₂ with the T₂ Phase Structure

Cited by 23 publications

References 26 publications

Superconductivity at 9 K inMo5PB2with evidence for multiple gaps

Superconductivity at 9 K inMo5PB2with evidence for multiple gaps

A comprehensive DFT based insights into the physical properties of tetragonal superconducting Mo5PB2

Electronic structure, bonding characteristics, and mechanical behaviors of a new family of Si-containing damage-tolerant MAB phases M5SiB2 (M = IVB—VIB transition metals)

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