Superconducting Properties of Mo2Re3Bx-Mo3Re2BxEutectic

Andrzejewski, B.; Guilmeau, Emmanuel; Kowałczyk, A.; Jurga, W.

doi:10.12693/aphyspola.111.727

Cited by 2 publications

(2 citation statements)

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“…The chemical composition of the two phases was determined by means of EDS and was presented in an earlier study [27]. The formula of the grey phase was Mo 3 Re 2 B x and of the black phase Mo 2 Re 3 B x .…”

Section: Resultsmentioning

confidence: 99%

“…The resistivity ρ ≈ 305 μ cm is indeed quite high when compared with other metals and decreases only gradually with temperature. The residual resistivity ratio (RRR), defined as RRR = R(10 K)/R(300 K), is also high and equal to 0.7 [27]. The explanation that suggests itself is that the semiconducting boron layer significantly increases resistivity and renders it almost temperature-independent.…”

Section: Resultsmentioning

confidence: 99%

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The effect of structure on flux instability and on the superconducting properties of the Mo₂Re₃B_x–Mo₃Re₂B_xeutectic

Andrzejewski¹,

Guilmeau²,

Kowałczyk³

2008

Supercond. Sci. Technol.

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We report on the structure and basic properties of a new eutectic system composed of Mo2Re3Bx and Mo3Re2Bx (x≈1) ternary borides. The alloy exhibits a complex globular structure and areas of locally ordered lamellar patterns. The superconducting areas are separated by a thin normal layer of excess boron and behave like an S–N–S′ Josephson junction network. Strong microwave absorption observed below 5 K implies a phase-locked transition having occurred in the network. The phase-locked state is accompanied by flux instability, most likely due to the rapid decoupling of the superconducting areas. A distinct, two-step superconducting transition was observed, which points to a lack of a proximity effect and demonstrates that the eutectic is an inhomogeneous system. The measured parameters of the dominating Mo3Re2Bx phase were Tc = 6.4 K, μ0Hc1 = 13 mT and μ0Hc2 = 6.5 T. These were found to correspond to the penetration depth λ = 2040 Å, coherence length ξ = 70 Å and Ginzburg–Landau parameter κ = 29. The linear temperature dependence of Hc2(T) in the Mo3Re2Bx phase implies a possible unconventional mechanism of pairing. The content of the minor Mo2Re3Bx phase was too low to warrant measurement of any parameters except the critical temperature Tc = 8.7 K.

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Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%