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Superconducting Properties of Amorphous Multilayer Metal-Semiconductor Composites

  • A. M. Kadin (a1), R. W. Burkhardt (a1), J. T. Chen (a2), J. E. Keem (a1) and S. R. Ovshinsky (a1)...

Abstract

Following the earlier multilayer work of Ovshinsky and colleagues, we have fabricated thin-film samples consisting of alternating periodic layers of a transition metal (Nb, Mo, W) and a semiconducting element (Si, Ge, C) by sequential sputtering from two targets onto room-temperature substrates. The regular repeat spacing has been varied from 10 Å to more than 100 Å, with as many as several hundred layer pairs. Crystalline epitaxy was not required or even desired; many samples were largely amorphous as determined from x-ray scattering. Electrical transport measurements of superconducting properties have been carried out parallel to the layers. Samples exhibited highly anisotropic superconducting critical magnetic fields, with some values in excess of 200kG parallel to the layers. Evidence suggesting an asymmetric interface profile will be presented.

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Superconducting Properties of Amorphous Multilayer Metal-Semiconductor Composites

  • A. M. Kadin (a1), R. W. Burkhardt (a1), J. T. Chen (a2), J. E. Keem (a1) and S. R. Ovshinsky (a1)...

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