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Dive into the research topics where H. Hiraka is active.

Publication


Featured researches published by H. Hiraka.


Physical Review B | 2010

Incommensurate Spin Correlations Induced by Magnetic Fe ions Substituted into Overdoped Bi1.75Pb0.35Sr1.90CuO6+z

H. Hiraka; Y. Hayashi; S. Wakimoto; Masayasu Takeda; K. Kakurai; T. Adachi; Yoji Koike; I. Yamada; Masanori Miyazaki; Masatoshi Hiraishi; S. Takeshita; A. Kohda; Ryosuke Kadono; J. M. Tranquada; K. Yamada

Spin correlations in the overdoped region of


Journal of the Physical Society of Japan | 2011

A New Growth Mechanism of Polar Nanoregions by Phonon-Relaxation Mode-Coupling in a Relaxor Ferroelectric

Masato Matsuura; H. Hiraka; K. Yamada; K. Hirota

{\text{Bi}}_{1.75}{\text{Pb}}_{0.35}{\text{Sr}}_{1.90}{\text{CuO}}_{6+z}


Physical Review B | 2010

Magnetic field effect on Fe-induced short-range magnetic correlation and electrical conductivity in Bi1.75Pb0.35Sr1.90Cu0.91Fe0.09O6+y

S. Wakimoto; H. Hiraka; Kazutaka Kudo; Daichi Okamoto; Terukazu Nishizaki; K. Kakurai; Tao Hong; A. Zheludev; J. M. Tranquada; Norio Kobayashi; K. Yamada

have been explored with Fe-doped single crystals characterized by neutron scattering, muon-spin-rotation spectroscopy, and magnetic-susceptibility measurements. Static incommensurate spin correlations induced by the Fe spins are revealed by elastic neutron scattering. The resultant incommensurability


Journal of Physics: Conference Series | 2010

Hot pressing of Ge crystals toward a reflection-plane-selective neutron monochromator

Yuko Miyake; H. Hiraka; Kenji Ohoyama; Y. Yamaguchi; K. Yamada

\ensuremath{\delta}


Journal of the Physical Society of Japan | 2011

Application of Hot-Pressed Ge-Crystal Monochromators for Reactor-Based Neutron Beam Experiments

H. Hiraka; Yuko Miyake; Sun Chang Che; Naoki Murakami; Manabu Ohkawara; Keiji Nemoto; Kazumasa Horigane; Kenji Ohoyama; Yasuo Yamaguchi; K. Yamada

is unexpectedly large


Nature Physics | 2010

Zero-doping state and electron-hole asymmetry in an ambipolar cuprate

Kouji Segawa; M. Kofu; Seunghun Lee; Ichiro Tsukada; H. Hiraka; Masaki Fujita; Sung Chang; K. Yamada; Yoichi Ando

(\ensuremath{\sim}0.2\text{ }\text{r}\text{.l}\text{.u}\text{.})


Physica B-condensed Matter | 2011

Development and test of SEOP neutron spin filter in Japan

Hiroshi Kira; Yoshifumi Sakaguchi; Takayuki Oku; Jun-ichi Suzuki; Mitsutaka Nakamura; Masatoshi Arai; K. Kakurai; Y. Endo; Yasushi Arimoto; Takashi Ino; Hirohiko M. Shimizu; Takashi Kamiyama; K. Tsutsumi; Kenji Ohoyama; H. Hiraka; K. Yamada; L. J. Chang

, as compared with


Physica B-condensed Matter | 2011

External cavity design of high-power diode laser for polarized helium-3 neutron spin filters based on spin-exchange optical pumping

Y. Arimoto; T. Ino; H.M. Shimizu; Takashi Kamiyama; Hiroshi Kira; Takayuki Oku; Yoshifumi Sakaguchi; K. Kakurai; Kenji Sakai; Jun-ichi Suzuki; Satoshi Koizumi; Masatoshi Arai; Y. Endo; Mitsutaka Nakamura; Takenao Shinohara; Masayasu Takeda; S. Wakimoto; Dai Yamazaki; K. Ohoymama; H. Hiraka; K. Yamada; K. Tsutsumi; L. J. Chang

\ensuremath{\delta}\ensuremath{\sim}1/8


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2011

Characterization of glasses for 3He neutron spin filter cells

Yoshifumi Sakaguchi; Hiroshi Kira; Takayuki Oku; Takenao Shinohara; Jun-ichi Suzuki; Kenji Sakai; Mitsutaka Nakamura; Kentaro Suzuya; Masatoshi Arai; Masayasu Takeda; S. Wakimoto; Dai Yamazaki; Satoshi Koizumi; Y Endoh; K. Kakurai; Yasushi Arimoto; T. Ino; Hirohiko M. Shimizu; Takashi Kamiyama; Kenji Ohoyama; H. Hiraka; K. Tsutsumi; K. Yamada; L. J. Chang

in overdoped superconductor


Nuclear Instruments & Methods in Physics Research Section A-accelerators Spectrometers Detectors and Associated Equipment | 2011

Plastically deformed Si-crystal wafers for neutron-monochromator elements

H. Hiraka; K. Fujiwara; K. Yamada; Kohei Morishita; Kazuo Nakajima

{\text{La}}_{2\ensuremath{-}x}{\text{Sr}}_{x}{\text{CuO}}_{4}

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K. Kakurai

Japan Atomic Energy Agency

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Masayasu Takeda

Japan Atomic Energy Agency

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S. Wakimoto

Japan Atomic Energy Agency

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Hiroshi Kira

Japan Atomic Energy Agency

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Jun-ichi Suzuki

Japan Atomic Energy Agency

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Takayuki Oku

Japan Atomic Energy Agency

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