• D S Misra

      Articles written in Bulletin of Materials Science

    • Characterization of a-Si:H thin films prepared by dc glow discharge of silane

      D S Misra P N Dixit S C Agarwal

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      A dc glow discharge apparatus for preparing amorphous silicon films from silane gas is described. The films are characterized by electron microscopy, infrared spectroscopy, electrical conductivity and photoconductivity. The deposition parameters which give good photoconducting films are established. The Staebler-Wronski effect is studied and is found to be smaller in vacuum than in air. A photovoltage is observed in structures with gold as the Schottkybarrier metal. The conversion efficiency of the device is about 1%. The results are compared with those in the literature, and the improvements which might result in a better conversion efficiency are pointed out.

    • Use of Nd: YAG laser forin situ growth of thin films of Y1Ba2Cu3O7−δ

      D S Misra A A C S Lourenco S B Palmer

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      As-deposited superconducting films of Y1Ba2Cu3O7−δ with zero resistance at a temperature of ⋍ 80 K have been successfully grown using a Nd:YAG laser. A substrate temperature in the range 450–550°C was found most appropriate. The use of a Nd:YAG laser instead of an excimer laser is likely to improve the cost effectiveness of the laser ablation technique.

    • Crystal field excitations in electron superconductors

      A T Boothroyd S M Doyle D McK Paul D S Misra R Osborn

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      We have measured the complete crystalline electric field (CEF) spectrum of Nd3+ in superconducting Nd1·85Ce0·15CuO4 and Nd2CuO3·7F0·3, and in the non-superconducting parent compound, Nd2CuO4, by neutron inelastic scattering. The best description of the ground-state excitations for both compounds is achieved by the addition of a molecular field parameter to the CEF hamiltonian that takes account of exchange interactions from Nd or Cu spin ordering.

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