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Search indexed NASA NTRS and DOE OSTI research on propulsion, heat transfer, battery materials and energy systems. Follow report and document links to the original sources.
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Shielding a test chamber for magnetic components enables it to maintain a constant, low magnetic field. The chamber is shielded from ambient magnetic fields by a lead foil cylinder maintained in a superconducting state by liquid helium.
High field magnetization, superconductivity, and tunneling properties of refractory metal single crystals
Reliability and characteristics of current transfer in high field superconducting magnets
Magnetization experiments in superimposed dc and audiofrequency ac magnetic fields on cold worked NbTi alloy samples - ac field induced flux jumps
Landau-Ginzburg theory extended to anisotropic superconducting energy gap, considering diffuse and specular boundary scattering
Magnetic flux flow and stability of superconducting niobium titanium strips
Wave equation for electron pairs under self consisting field in interacting fermions system, obtaining Landau-Ginzberg type equation
Superconducting properties of niobium-tin alloy and large single crystal growth
Superconducting flux-flow resistivity minimum in Pb-Tl alloy, discussing thermal dissipation associated with temperature gradients across moving fluxoid
Superconducting magnets steady state stability improvement by using composite conductors
Superconducting lead shell shielding properties in small ambient magnetic fields
Compounds having beta tungsten structure exist as solid solutions over composition range of several percent. However, for most of these compounds, relationship between composition and superconducting transition temperature is not known.
Investigating problems of stability and flux jumping in superconducting materials
Flux pinning mechanisms in type-2 semiconductors and specific heat measurements on annealed and deformed pure niobium samples
Differential energy losses of alpha particles traversing materials in superconducting and normal states
The Maki contribution to the conductivity above the superconducting transition temperature is regularized within the framework of the BCS theory. This is achieved through the renormalization of the impurity scattering vertex by inclusion of the effects of pair fluctuations. The conductivity is evaluated for a thin film. It depends only on the reduced temperature and the normal resistance per square. Fair agreement is found with Al films over a wide temperature range. Agreement is not found with experiments on Bi, Pb and Ga films, which apparently contain a strong additional pair-breaking effect. The temperature range in which interactions among fluctuations become important in the Maki conductivity is generally larger than that given by the Ginzburg criterion.
A study aimed at fabricating a stabilized conductor containing both binary and ternary intermetallics of the Nb-Al system is presented.
The Maki contribution to the conductivity above the superconducting transition temperature is regularized within the framework of the BCS theory. This is achieved through the renormalization of the impurity-scattering vertex by inclusion of the effects of pair fluctuations. The conductivity is evaluated for a thin film. It depends only on the reduced temperature and the normal resistance per square. Fair agreement is found with Al films over a wide temperature range. Agreement is not found with experiments on Bi, Pb, and Ga films, which apparently contain a strong additional pair-breaking effect. The temperature range in which interactions among fluctuations become important in the Maki conductivity is generally larger than that given by the Ginzburg criterion.