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206. Systematic variation of magnetic-field penetration depth in high-Tc superconductors studied by muon-spin relaxation

Author

Uemura, Y. J, Emery, V. J, Moodenbaugh, A. R, Suenaga, M, and Johnston, D. C

Subjects
Solid-State Physics
Abstract

The muon relaxation rate (sigma) was measured in the high critical temperature superconductors YBa2Cu3O(x) for x = 6.66, 6.95, 7.0, and La1.85 SrO.15 CuO4 in transverse external magnetic fields 1 is approximately 4 kG. A simple relation is found which connects the transition temperature T(c), the magnetic field penetration depth lambda(L), the carrier concentration n(s) and the effective mass m* as T(c) varies as sigma which varies as 1/lambda(L) squared which varies as n(s)/m*. The linear dependence T(c) varies as n(s)/m* suggests a high energy scale for the coupling between superconducting carriers.

Published
1988
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229. Understanding Properties and Fabrication Processes of Superconducting Nb3Sn Wires.

Author

Timmerhaus, K. D., Rizzuto, Carlo, Timmerhaus, Klaus D., Reed, Richard P., and Suenaga, M.

Abstract

The fabrication of multifilamentary Nb3Sn wireswas started by the discovery of the bronze process, a solid-state diffusion process, to form filamentary A15 structure compounds in 1969-1970. Through a number of improvements and modifications of the original process in the ensuing years, these wires are nowindispensable components for the construction of magnets, producing very high magnetic fields for nuclear magnetic resonance spectroscopy, magnetic fusion experiments, and future high-energy particle accelerators. A comprehensive review article summarizes the state of the knowledge up to 1980 on the formation mechanisms and the superconducting properties of the A15 compounds that were fabricated by this process. Since 1980, significant advances have been made in the basic understanding of the factors controlling the growth processes, and basic superconducting properties of the bronze-processed Nb3Sn. In particular, significant progress has been made in understanding the effects of alloying on these properties and mechanisms for fluxline pinning in the compound. Furthermore, for the practical usage of these wires, tremendous progress in the critical-current densities of multifilamentary Nb3Sn wires has been made over the last several years. This chapter reviews these new findings about Nb3Sn by the solid-state diffusion process and the critical-current densities of the state-of-the-art multifilamentary Nb3Sn wires. [ABSTRACT FROM AUTHOR]

Published
2007
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