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15 Sep 1976

Volume 29, Issue 6, pp. 323-391

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Fabrication of multifilament Nb3Sn conductors

Y. Koike, H. Shiraki, S. Murase, E. Suzuki, and M. Ichihara

Appl. Phys. Lett. 29, 384 (1976); http://dx.doi.org/10.1063/1.89096 (3 pages) | Cited 6 times

Online Publication Date: 28 August 2008

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Multifilament conductors have been fabricated using niobium tubes with a sheathed tin‐copper alloy inside and pure copper matrix outside. These composites have good workability, cold drawn without any intermediate heat treatment. Sample evaluation has included measurements of critical temperature, resistivity, and critical current density. The Nb3Sn formed by this method has much higher critical current density than the previous one with approximately the same tin concentration (12 at.%), but lies on the line extrapolated from the bronze method over the solid solubility limit.
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74.70.-b Superconducting materials other than cuprates
74.25.Sv Critical currents

Temperature dependence of superconducting critical current density and upper critical field for the V/Hf0.4Zr0.6 Laves phase tape

K. Inoue and K. Tachikawa

Appl. Phys. Lett. 29, 386 (1976); http://dx.doi.org/10.1063/1.89097 (3 pages) | Cited 3 times

Online Publication Date: 28 August 2008

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The temperature dependence of the superconducting critical current density Jc and the upper critical field Hc2 has been studied for the composite‐processed V/Hf0.4Zr0.6 tape, in which the C‐15 crystal‐type Laves phase compound is formed by diffusion between the vanadium sheath and the Hf0.4Zr0.6 alloy core. Jc of the V/Hf0.4Zr0.6 rapidly increases with decreasing temperature. At 1.7 K the V/Hf0.4Zr0.6 shows higher Hc2 and Jc than those of commercially available Nb3Sn and V3Ga. A superconducting magnet wound with V/Hf0.4Zr0.6 tape might be able to generate a magnetic field exceeding 200 kOe at 1.7 K.
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74.70.-b Superconducting materials other than cuprates
74.25.Sv Critical currents
74.25.Uv Vortex phases (includes vortex lattices, vortex liquids, and vortex glasses)
85.25.-j Superconducting devices

Magnetostatic wave propagation in a periodic structure

C. G. Sykes, J. D. Adam, and J. H. Collins

Appl. Phys. Lett. 29, 388 (1976); http://dx.doi.org/10.1063/1.89098 (4 pages) | Cited 48 times

Online Publication Date: 28 August 2008

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Magnetostatic wave propagation at microwave frequencies through a periodic structure formed by selectively etching the surface of an epitaxial yttrium iron garnet (YIG) film is reported. Experimental insertion loss data obtained in the 2–4‐GHz range from a structure comprising 20 grooves each 1 μm deep and 30 μm wide, and each separated by 120 μm, formed in a 9‐μm‐thick YIG film are in good agreement with theory based on repetitively mismatched transmission lines.
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84.70.+p High-current and high-voltage technology: power systems; power transmission lines and cables
85.70.Ge Ferrite and garnet devices
84.40.Az Waveguides, transmission lines, striplines
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