Superconducting thin films of Bi(Pb)-Sr-Ca-CuO system were prepared by depositing the film onto silver substrate by d.c. electrodeposition technique with dimethyl sulphoxide bath in order to examine the effect of Pb addition to the BSCCO system. The films were deposited at the potential of-0⋅ ⋅8 V vs saturated calomel electrode (SCE) onto the silver substrate. The different preparative parameters such as deposition potential, deposition time were studied and optimized. These films were then oxidized electrochemically at room temperature in an alkaline (1 N KOH) solution, and also at 600°°C temperature in an oxygen atmosphere. The films showed the superconducting behaviour, with T c values ranging between 85 K and 96 K, respectively.

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In the present investigation, the novel two-step electrochemical process of room temperature synthesis of Hg-1212 superconducting films has been developed and reported first time. Electrochemical parameters were optimized by studying cyclic voltammetry (CV), linear sweep voltammetry (LSV) and chronoamperometry (CA) for the deposition of Hg-Ba-Ca-Cu alloy at room temperature. Current time transient showed progressive growth with hemispheriodal granules, which were then revealed by scanning electron microscopy (SEM).Stoichiometric electrocrystallization to get Hg 1 Ba 2 Ca 1 Cu 2 O 6+x (Hg-1212) was completed by electrochemically intercalating oxygen species into Hg-Ba-Ca-Cu alloy at room temperature. The oxygen content in the samples was varied by varying the electrochemical oxidation period and the changes in the crystal structure, microstructure, and superconducting transition temperature (T c ) and critical current density (J c ) were recorded.The films oxidized for 28 min showed T c = 104.7 K with J c = 1.437 x 10 3 A/cm 2 . The dependence of superconducting parameters on oxygen content is correlated with structure property relations and reported in this paper. * The corresponding author

Junctions between metal, semiconductor and superconductor materials seem to be promising for their application as electronic devices, microelectronic devices and high power transmission. We fabricated Ag/Tl±Ba±Ca±CuO/CdSe nanostructures by using dc electro-deposition technique. The Tl±Ba±Ca±Cu alloyed thin ®lms were deposited onto silver substrate at a constant potential of À1.25 V and then oxidized electrochemically at a potential of 0.7 V with respect to saturated calomel electrode (SCE) from 1 N KOH solution. Semiconducting CdSe was subsequently deposited onto superconducting system at a constant potential of À0.6 V with respect to SCE. Particle size con®rmed the presence of nanostructure, of the order of 27 nm. The sizeable change of the electrical conductivity was obtained by irradiating the nanostructure with red He±Ne laser (l 632:8 nm) for different periods. #

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