• S R Jha

      Articles written in Pramana – Journal of Physics

    • Critical current in silver clad Y-Ba-Cu-O superconducting wires

      R G Sharma Y S Reddy S R Jha S S Dubey

      More Details Abstract Fulltext PDF

      Silver clad wires of highTc superconductor Y1Ba2Cu3O7−x have been fabricated through the powder metallurgy technique. The reacted wires show a midpointTc of 84K. A critical current density of 26·4 A cm−2 (77K, 0T) is obtained in these wires. The wires, however, turn complete normal only at a current density of 280 A cm−2. The reasons for low critical current density obtained in these wires are discussed.

    • Influence of oxygen deficiency on the thermoelectric power of Y1Ba2Cu3O7-x

      S R Jha Y S Reddy D K Suri K D Kundra R G Sharma Deepak Kumar

      More Details Abstract Fulltext PDF

      In this paper we report measurements of the thermoelectric power on a series of Y1Ba2Cu3O7-x specimens with varying amounts of oxygen deficiency obtained by changing the cooling rate of the sintered specimens. The specimens have been characterized by X-ray diffraction measurements, electric resistivity and oxygen contents. The temperature variation of the thermopower reveals a peak just before the onset of superconducting transition. We examine possible theoretical explanations of this anomaly. In particular we argue that this anomaly is associated with the pairing fluctuations in the normal state close toTc. We present some theoretical results in support of this conclusion.

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