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8 Result(s)

within Naoki Koshizuka Remove this filter Electronics and Microelectronics, Instrumentation Remove this filter

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  1. No Access

    Chapter and Conference Paper

    Tunneling Measurements on YBa2Cu4O8 under Magnetic Fields

    Tunneling measurements on YBa2Cu4O8 were performed systematically for the first time. Tunnel junctions were fabricated by depositing Au layers directly on the surface of sintered samples. Effects of magnetic fiel...

    Koichi Nakao, Shigeto Fujita, Masanori Nemoto… in Advances in Superconductivity III (1991)

  2. No Access

    Chapter and Conference Paper

    Copper Nuclear Relaxation Rate and Knight Shift in YBa2Cu4O8

    The temperature dependences of the 63Cu nuclear spin-lattice relaxation rate 1/Ti for the Cu(1) chain sites and the planar Cu(2) sites in YBa2Cu4O8 have been measured by nuclear quadrupole resonance(NQR). The in-...

    Takato Machi, Izumi Tomeno, Takayuki Miyatake… in Advances in Superconductivity III (1991)

  3. No Access

    Chapter and Conference Paper

    Magnetization Properties of YBCO Prepared by MPMG Process

    Magnetization properties of YBaCuO samples prepared by melt-powder-meltgrowth (MPMG) process are different from those of the sintered samples, because the MPMG processed sample does not have weak-links and the...

    Hiroyuki Fujimoto, Masato Murakami, Satoshi Gotoh… in Advances in Superconductivity III (1991)

  4. No Access

    Chapter and Conference Paper

    Photoemission Study of Bi2Nd0.5Ca2.5Cu2Oy and Bi2(La,Pr)0.5Ca2.5Cu2Oy Superconductors

    X-ray photoelectron spectra (XPS) of Cu 2p have been studied for oxygen- and air-sintered samples of Bi2(La,Pr)0.5Ca2.5Cu2Oy and Bi2Nd0.5Ca2.5Cu2Oy. We estimated the number of Cu 3d electrons, n ...

    Kazuto Ikeda, Fumio Munakata, Rittaporn Itti… in Advances in Superconductivity III (1991)

  5. No Access

    Chapter and Conference Paper

    Specific Heat of YBa2Cu4O8 near Tc

    Specific heat measurements are reported for a polycrystalline, bulk sample of YBa2Cu4O8 prepared at high oxygen pressure. The magnitude of the idealized specific heat jump ΔCp/T at Tc (=80 ± 0.5K) is 15.5±2 mJ/K2

    J. O. Willis, Izumi Tomeno, Takayuki Miyatake… in Advances in Superconductivity III (1991)

  6. No Access

    Chapter and Conference Paper

    Dynamical Magnetic Flux Behavior in High-Tc Oxide Superconductors

    The dynamical magnetic flux behavior in MPMG-processed YBaCuO was observed using the motion of stripe magnetic domains on an iron garnet film placed on the specimen. Optical observation of the domain structure...

    Satoshi Gotoh, Naoki Koshizuka, Masashi Yoshida… in Advances in Superconductivity III (1991)

  7. No Access

    Chapter and Conference Paper

    Raman Scattering from Spin-Pair Excitations in Pr2−xCexCuO4−yNd2−xCexCuO4−y and Sm2−xCexCuO4−y

    Antiferromagnetic excitations in single crystals of Pr2−xCexCuO4−y, Nd2xCexCuO4−y and Sm2−xCexCuO4−y were investigated as a function of Ce concentration using Raman scattering at room temperature. The introductio...

    Izumi Tomeno, Masashi Yoshida, Kazuto Ikeda… in Advances in Superconductivity III (1991)

  8. No Access

    Chapter and Conference Paper

    Phonons in (Sm,Ce)2(Ba,Sm)2Cu3Ox

    Polarized Raman spectra of (Sm,Ce)2(Ba,Sm)2Cu3Ox which has Cu-O5 pyramid structure as well as YBa2Cu3O7 have been measured at room temperature using single crystals. Peaks have been observed at 442 and 537 cm−1 i...

    Masashi Yoshida, Setsuko Tajima, Yuri Mizuo… in Advances in Superconductivity III (1991)