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坂井 徹; 奥西 巧一*; 岡本 清美*; 糸井 千岳*; 佐藤 正寛*
Journal of Low Temperature Physics, 159(1-2), p.55 - 59, 2010/04
被引用回数：8 パーセンタイル：37.46(Physics, Applied)S=1/2三本鎖スピンナノチューブに対する数値的厳密対角化と密度行列繰り込み群による数値解析により、この系の非対称性によって異なる二つのメカニズムにより、飽和磁化の3分の1のところに磁化プラトーが現れることが判明した。
稲見 俊哉; 大和田 謙二; 松田 康弘*; Ouyang, Z. W.*; 野尻 浩之*; 松村 武*; 奥山 大輔*; 村上 洋一*
no journal, ,
In the last five years, the active development of X-ray diffraction techniques under pulsed high magnetic field has enabled us to observe structural changes of crystals above 30 T. Since X-rays are also an experimental tool for detecting electronic degrees of freedom through resonant process, the development of resonant X-ray diffraction techniques under pulsed high magnetic field introduces a new microscopic probe to the high magnetic field science. After several improvements of the experimental techniques, we observed field dependence of the 100 and 500 magnetic reflections of the tetragonal rare-earth tetraboride TbB
, which exhibits a number of magnetization plateaus between 16 T and 28 T. The obtained field, polarization, and scattering angle dependence indicates that magnetic moments perpendicular to the magnetic field exist in the high-field plateau phases. This result is inconsistent with normal fractional magnetization plateau phases that consist of up and down spins.
松田 雅昌; 本多 善太郎*; 香取 浩子*; 高木 英典*; 植田 浩明*; 上田 寛*; 三田村 裕幸*; 金道 浩一*
no journal, ,
LiCrMnO shows an interesting behavior in magnetic field. Magnetization in LiCrMnO gradually increases and saturates at 
1/2 of the full moment (3
). This phenomenon is similar to the half-magnetization plateau observed in ACr
O (A: Cd and Hg), which originates from a strong spin-lattice coupling. We performed neutron scattering experiments in LiCrMnO4 in magnetic field up to 10 T to clarify the origin of the plateau-like state. It was found that the magnetic peak at 
0.6 
is suppressed with increasing magnetic field although the magnetic peak at 1.6 is robust. This result suggests that the saturation of the magnetization is not related with the spin-lattice coupling as in ACrO but spins in phase 2 first align ferromagnetically in low magnetic field. This indicates that the magnetic interactions in phase 2 are relatively small, suggesting that the phase 2 is formed by further-neighbor interactions.
