Skip to main content

5 Result(s)

within Conference Paper Remove this filter Z. Hiroi Remove this filter

and

  1. No Access

    Chapter and Conference Paper

    Novel Transition Metal Oxides Prepared at High Pressure and Their Electronic Properties

    We have searched for transition metal oxides exhibiting interesting electronic properties by using various preparative techniques. High pressure synthesis at 3GPa and 1200K, typically, has yielded, for example...

    M. Takano, Z. Hiroi, M. Azuma, S. Kawasaki… in Physics and Chemistry of Transition Metal … (1999)

  2. No Access

    Chapter and Conference Paper

    Dramatically Improved Flux Pinning Properties of Heavily Pb-Doped Bi2212 Single Crystals and Ag Composite Tapes

    Magnetization properties of Bi(Pb)2212 single crystals were found to be systematically improved by increasing Pb-do** and oxygen do** levels. At the liquid nitrogen temperature, the heavily Pb- doped and m...

    J. Shimoyama, Y. Nakamama, T. Motohashi, T. Fujita… in Advances in Superconductivity X (1998)

  3. No Access

    Chapter and Conference Paper

    Chemical Stabilization and Flux Pinning in Hg-Based Superconductors

    Effect of chemical stabilization by substitution of a small amount (0.1~0.25) of rhenium (Re) ion on the Hg-site in HgM2Can-1Cun0y (M=Ba or Sr, n=l~4) has been studied. The flux pinning behavior in these Hg-based...

    K. Kishio, J. Shimoyama, K. Yamaura, Z. Hiroi… in Advances in Superconductivity VIII (1996)

  4. No Access

    Chapter and Conference Paper

    Superconductivity in the Infinite-Layer Phase Stabilized Under High Pressure

    Cupric-oxide superconductors are complex oxides involving counter cations like rare-earth and alkaline-earth ions. Counter cations and cupric ions compromise with each other to coexist in a crystal by adjustin...

    M. Takano, Z. Hiroi, M. Azuma in Electronic Properties of High-Tc Superconductors (1993)

  5. No Access

    Chapter and Conference Paper

    The Formation Process of the High-Tc Phase in the Bi-Pb-Sr-Ca-Cu-O System

    The formation process of the 2223 (high-Tc) phase in the Bi-Pb-Sr-Ca-Cu-O system has been studied for a nominal composition Bi:Pb:Sr:Ca:Cu=0.9:0.2:1:1:1.6. From this composition we obtained the high-Tc phase crys...

    H. Ito, Y. Ikeda, S. Shimomura, Z. Hiroi, M. Takano… in Advances in Superconductivity II (1990)