Zobrazeno 1 - 10
of 70
pro vyhledávání: '"Syoichi Hosoya"'
Autor:
K. Kurahashi, Yasuo Endoh, S. Wakimoto, Syoichi Hosoya, Chul-Ho Lee, Nobuhisa Kaneko, Kazuyoshi Yamada
Publikováno v:
Superconductor Science and Technology. 11:891-897
We grew large single crystals of reproducibly over a wide doping range using an improved travelling solvent floating zone (TSFZ) method. We performed a simulation on the lamp-image focusing to find an optimum condition for a steep temperature gradien
Publikováno v:
Journal of the Physical Society of Japan. 65:581-585
Systematic heat treatments have been performed using single crystals of La 2- x Bi x CuO 4+δ to study the effect of oxygen doping on the phase stability as well as the three-dimensional magnetic order. For La 2 CuO 4+δ , the analysis of magnetic su
Autor:
Yasuo Endoh, Martin Greven, Robert J. Birgeneau, Kensuke Nakajima, Kohta Yamada, Syoichi Hosoya
Publikováno v:
Zeitschrift f�r Physik B Condensed Matter. 96:479-489
The static and dynamic spin fluctuations in the spinS=1, two-dimensional (2D) square-lattice antiferromagnet La2NiO4 have been studied over a wide temperature range using neutron scattering techniques. The spin correlations in La2NiO4 exhibit a cross
Autor:
J. D. Perkins, Marc Kastner, Yasuo Endoh, Robert J. Birgeneau, D. S. Kleinberg, Kohta Yamada, Syoichi Hosoya
Publikováno v:
Physical Review B. 52:R9863-R9866
Measurements are reported of the transmission of single crystals of ${\mathrm{La}}_{2}$${\mathrm{NiO}}_{4}$ containing no excess oxygen. Several weak absorption bands are observed in the range 0.15--2 eV arising from magnetic and crystal-field excita
Autor:
Yasuo Endoh, Shinichi Itoh, Syoichi Hosoya, Masatoshi Arai, Kazuyoshi Yamada, Yoshikazu Hidaka
Publikováno v:
Journal of the Physical Society of Japan. 63:4542-4549
Inelastic neutron scattering experiments were performed using a chopper spectrometer, MARI, to elucidate the spin dynamics of two-dimensional quantum Heisenberg antiferromagnets of both La 2 CuO 4 ( S =1/2) and La 2 NiO 4 ( S =1) over a wide range of
Autor:
Andrew Taylor, Y. Hidaka, Syoichi Hosoya, A. C. Hannon, Yasuo Endoh, Masatoshi Arai, Kohta Yamada
Publikováno v:
Journal of Superconductivity. 7:415-418
The scattering function,S(Q, E), of superconducting La1.85Sr0.15CuO4 and YBa2Cu3O7 was measured over a wide range ofQ-E space by inelastic neutron scattering. Fine structures in their phonon density of states as well as theQ-dependences ofS(Q, E) wer
Publikováno v:
Physica C: Superconductivity. 221:355-362
The magnetic phase diagram of La2NiO4+δ is studied by magnetization and neutron scattering measurements. Three-dimensional (3d) magnetic order with an incommensurate Ni2+ spin modulation in the NiO2 plane appears beyond oxygen doping δ around 0.10.
Publikováno v:
Journal of the Physical Society of Japan. 62:4438-4448
Inelastic neutron magnetic scattering experiments were performed from the well characterized single crystal of La 2 NiO 4.00 ( T N =328 K) to study the spin-wave excitations in this system. The large energy gaps are observed at the two dimensional zo
Publikováno v:
Physica C: Superconductivity. 202:188-196
Excess oxygen content δ in single crystals of La2NiO4+δ is controlled by accurate heat treatments under various oxygen partial pressures. Magnetization and neutron diffraction revealed that the doping of excess oxygen induces new phases. In additio
Autor:
Syoichi Hosoya, George A. Sawatzky, Hirofumi Namatame, Takashi Mizokawa, J. van Elp, P. Kuiper, Atsushi Fujimori, Hiroshi Eisaki, S. Uchida, Hiroshi Katayama-Yoshida
Publikováno v:
Physical Review B. 45:12513-12521
The electronic structure of La2-xSrxNiO4 is studied by use of photoemission spectroscopy, bremsstrahlung-isochromat spectroscopy (BIS), and electron-energy-loss spectroscopy. Quantitative analyses are made on the valence-band and Ni 2p core-level pho