Superconductivity of NbSn2

Ooijen, D.J. van; Vucht, J.H.N. van; Druyvesteyn, W.F.

doi:10.1016/0031-9163(62)90058-6

Cited by 16 publications

(10 citation statements)

References 3 publications

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“…Unfortunately, however, compositional information is not available for this bulk sample, a high degree of uncertainty is stated for their reported resistivity value of 300 µΩcm, and the corresponding T c value of 15.1 K would place the Sn content around 23%. Nevertheless, (10) and (11) summarize the consistent existing literature data on well defined, homogeneous laboratory samples for the main superconducting parameters T c and H c2 as function of composition.…”

Section: IVsupporting

confidence: 63%

“…29 µΩcm (2) / 22 µΩcm (3) = 24.5% field-temperature dependence of the Nb-Sn can thus be summarized to depend solely on composition using (10) and (11) as was recently postulated [52].…”

Section: Discussionmentioning

confidence: 82%

“…Unfortunately, however, compositional information is not available for this bulk sample, a high degree of uncertainty is stated for their reported resistivity value of 300 µΩcm, and the corresponding T c value of 15.1 K would place the Sn content around 23%. Nevertheless, (10) and (11) To describe the critical currents in wires, not only the upper critical field at zero temperature and zero field critical temperature are important. Also an accurate description of the entire field-temperature phase boundary is required.…”

Section: IVmentioning

confidence: 99%

“…The curves are fits to the data according to microscopic theory using the Maki-de Gennes approximation [52]. The depicted compositions and resistivities were calculated from the T c (0) values using (10) and (5). All samples were measured in a Vibrating Sample Magnetometer (VSM) using the first observable diamagnetic deviation from reversible normal state paramagnetic behavior as criterion for H c2 (which approximately corresponds to a 90% resistive criterion [52]), except the β = 23.8 at.% Sn sample which was measured resistively, using a 90% normal state criterion.…”

Section: Hc2(t ) Of Bulk Materialsmentioning

confidence: 99%

“…FIG.7: Literature results for the critical temperature (left pot) and upper critical field at zero temperature (right plot) as function of Nb-Sn composition. The Tc(β) Boltzmann function(10) and the µ0Hc2(β) function (11) are empirical relations that summarize the available literature results.…”

mentioning

confidence: 99%

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A review of the properties of Nb₃Sn and their variation with A15 composition, morphology and strain state

Godeke¹

2006

Supercond. Sci. Technol.

234

213

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Significant efforts can be found throughout the literature to optimize the current carrying capacity of Nb3Sn superconducting wires. The achievable transport current density in wires depends on the A15 composition, morphology and strain state. The A15 sections in wires contain, due to compositional inhomogeneities resulting from solid state diffusion A15 formation reactions, a distribution of superconducting properties. The A15 grain size can be different from wire to wire and is also not necessarily homogeneous across the A15 regions. Strain is always present in composite wires, and the strain state changes as a result of thermal contraction differences and Lorentz forces in magnet systems. To optimize the transport properties it is thus required to identify how composition, grain size and strain state influence the superconducting properties. This is not accurately possible in inhomogeneous and spatially complex systems such as wires. This article therefore gives an overview of the available literature on simplified, well defined (quasi-)homogeneous laboratory samples. After more than 50 years of research on superconductivity in Nb3Sn, a significant amount of results are available, but these are scattered over a multitude of publications. Two reviews exist on the basic properties of A15 materials in general, but no specific review for Nb3Sn is available. This article is intended to provide such an overview. It starts with a basic description of the Niobium-Tin intermetallic. After this it maps the influence of Sn content on the the electron-phonon interaction strength and on the field-temperature phase boundary. The literature on the influence of Cu, Ti and Ta additions will then be briefly summarized. This is followed by a review on the effects of grain size and strain. The article is concluded with a summary of the main results.

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Section: IVsupporting

confidence: 63%

Section: Discussionmentioning

confidence: 82%

“…Unfortunately, however, compositional information is not available for this bulk sample, a high degree of uncertainty is stated for their reported resistivity value of 300 µΩcm, and the corresponding T c value of 15.1 K would place the Sn content around 23%. Nevertheless, (10) and (11) To describe the critical currents in wires, not only the upper critical field at zero temperature and zero field critical temperature are important. Also an accurate description of the entire field-temperature phase boundary is required.…”

Section: IVmentioning

confidence: 99%