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Now showing 1 - 5 of 5
  • (1997) Das, T; Munroe, Paul; Bandyopadhyay, Srikanta; Bell, Toby; Swain, M
    Journal Article

  • (1995) Bandyopadhyay, Srikanta; Mukherjee, S; Perera, D; Mori, K; Swain, M; Bell, Toby
    Conference Paper

  • (1995) Zhao, Yong; Xiong, Z; Zhang, H; Chen, B
    Journal Article
    The effects of Sn doping on the superconductivity and the electronic properties of the YBaSrCu3−xSnxOy system have been investigated by electronic transport and electron paramagnetic resonance (EPR) measurements. The superconductivity of the system is gradually depressed by Sn doping. Meanwhile, the carrier concentration is decreased and the EPR absorption is restored by doping Sn4+ at the Cu(1) site. Our results strongly suggest the localisation of the Cu2+ states at Cu---O chains, which is responsible for the reduction of the carriers and the suppression of the superconductivity.

  • (1995) Zhao, Yong; Zhang, Yanling; Choi, Caroline; Chen, B; Sorrell, Charles
    Journal Article
    Sr-based 123 compounds R1-xCaxSr2Cu2.7Mo0.3Oy with R = Pr, Nd, and Y are successfully stabilised by partial substitution of Mo for Cu. A tetragonal-orthorhomic-tetragonal transition is observed for R = Y and Nd, which is induced by different oxygen content in the samples. Tc of the samples is sensitive to the oxygen content other than the structure. For Pr-contained samples the resistivity decreases systematically with increasing the Ca dopant and oxygen content. The results show that the hybridisation of the conduction electrons with the 4f band of Pr in Sr-based 123 compounds is weaker than that in Ba-based 123 compounds.

  • (1998) Wool, R; Kusefoglu, S; Khot, S; Zhao, R; Palmese, Gaetano; Boyd, Andrew; Fisher, Keith; Bandyopadhyay, Srikanta; Williams, J; Wang, Chaoyuan
    Conference Paper