A V Narlikar
Articles written in Bulletin of Materials Science
Volume 14 Issue 3 June 1991 pp 777-781 International Conference On Superconductivity—II
The differential microwave absorption is studied in the field-cooled samples. Flux-trapping during field-cooling is clearly demonstrated. Glassy behaviour starts appearing for fields greater than the lower intergranular critical field revealed by the difference between field-cooled and zero-field-cooled cases. Results can be understood in terms of super-conducting cluster model.
Volume 14 Issue 3 June 1991 pp 789-792 International Conference On Superconductivity—II
Low-field differential microwave absorption has been studied for hafnium-doped Y-Ba-Cu-O at the first harmonic of modulation field. The effect of modulation amplitude on peak height, peak position and the area under hysteresis curve has been discussed.
Volume 14 Issue 3 June 1991 pp 871-876 International Conference On Superconductivity—II
Results of the XRD, XPS, XANES, iodometric titration and transport studies on freshly prepared Ce, Zr and Ti substituted 1-2-3 samples are reported here. It is argued that at least 2% of Ce, Zr and Ti ions go into the 1-2-3 lattice. It is found that Zr, Ti ions exist in 4+ valence state, Ce is in predominantly 4+ (mixed valence) state and valence of Cu remains unaffected on substitution.
Volume 14 Issue 6 December 1991 pp 1343-1348
Single crystals of Bi2Sr2CaCu2O8 (2212) have been grown by self-flux technique using stoichiometric and non-stoichiometric melts of excess CuO and Bi2O3. Single-crystal and powder X-ray diffraction studies have been made on the grown crystals to confirm their single crystallinity and structure respectively. Resistivity and susceptibility measurements provide information on the superconducting nature of the crystals. The effects of fluxing agents and starting composition on surface morphology and superconducting properties have been discussed.
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