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Takeda, Masayasu; Nakamura, Mitsutaka; Kakurai, Kazuhisa; Mibu, Ko*; Leli
vre-Berna, E.*
Physica B; Condensed Matter, 397(1-2), p.56 - 58, 2007/07
Times Cited Count：0 Percentile：0(Physics, Condensed Matter)In Cr/Sn(001) multilayers in which monatomic Sn nonmagnetic layers are periodically embedded, spin-density-wave(SDW)s are formed below N
el temperature like that in bulk Cr. It is, however, quite different to the SDW in bulk Cr. For instance the wavelength of the SDW is defined not by the nesting vector of Cr, but by the artificial periodicity introduced by the Sn layers. We did the spherical polarization analysis of this anomalous SDW structures by using CRYOPAD (CRYOgenics Polarization Analysis Device) as well as the one-dimensional polarization analysis.
Oku, Takayuki; Yamada, Satoru; Shinohara, Takenao; Suzuki, Junichi; Mishima, Kenji*; Hirota, Katsuya*; Sato, Hiromi*; Shimizu, Hirohiko
Physica B; Condensed Matter, 397(1-2), p.188 - 191, 2007/07
Times Cited Count：5 Percentile：27.18(Physics, Condensed Matter)We have studied a neutron polarization method by means of a quadrupole magnet. By passing through the aperture of the quadrupole magnet (QM), positive and negative polarity neutrons are accelerated in opposite directions and spatially separated due to the magnetic field gradient. Then, by extracting one spin component, we can obtain a highly polarized neutron beam. Since polarized neutrons do not interact with any substances in this method, we can obtain the polarized neutron beam free from neutron attenuation. As a result of a cold neutron beam polarization experiment by using the QM, we obtained extremely high neutron polarization degree P0.999. In this paper, we show some experimental results of the neutron polarization experiment and discuss the application of the QM-based polarizing device to neutron scattering experiments.
Lelivre-Berna, E.*; Brown, P. J.*; Tasset, F.*; Kakurai, Kazuhisa; Takeda, Masayasu; Regnault, L.-P.*
Physica B; Condensed Matter, 397(1), p.120 - 124, 2007/07
Times Cited Count：23 Percentile：67.31(Physics, Condensed Matter)no abstracts in English
Matsuda, Masaaki
no journal, ,
no abstracts in English
Kakurai, Kazuhisa; Osawa, Akira*; Nishiwaki, Yoichi*; Kato, Tetsuya*
no journal, ,
We report the results of polarized neutron inelastic scattering experiments on the quasi-one dimensional Ising-like antiferromagnet TlCoCl. The longitudinal spin fluctuation in the spin-wave excitation continuum has been clearly identified. The observed longitudinal fluctuation together with the transverse fluctuation are compared with the predictions of the perturbation theory from the pure Ising limit by Ishimura and Shiba.
