Akira Oosawa

Intermediate Phase IV in Structural Phase Transitions of TlCoCl$_3$ (2008)

Nishiwaki, Yoichi, Oosawa, Akira, Kato, Tetsuya, Hasegawa, Takumi, Kuroe, Haruhiko, Kakurai, Kazuhisa

The structural changes of TlCoCl$_3$ around phase IV (68 K $

\mu SR-detection of the soft-mode toward the exotic magnetic ground state in bond-disordered quantum spin system IPA-Cu(Cl$_{0.35}$Br$_{0.65}$)$_3$ (2008)

Goto, Takayuki, Suzuki, Takao, Kanada, Keishi, Saito, Takehiro, Oosawa, Akira, Watanabe, Isao, ...

The spin-gap system with a bond-disorder (CH3)2CHNH3-Cu(ClxBr1-x)3 is reported by experiments on macroscopic quantities of the uniform susceptibility and the specific heat to show a magnetic order at...

Magnetic field-induced one-magnon Raman scattering in the magnon Bose-Einstein condensation phase of TlCuCl$_{3}$ (2008)

Kuroe, Haruhiko, Kusakabe, Kouhei, Oosawa, Akira, Sekine, Tomoyuki, Yamada, Fumiko, Tanaka, Hidekazu, ...

We report the observation of the $A_{\rm g}$-symmetric one-magnon Raman peak in the magnon Bose-Einstein condensation phase of TlCuCl$_{3}$. Its Raman shift traces the one-magnon energy at the...

The effect of randomness on the quantum spin system Tl$_{1-x}$K$_x$CuCl$_3$ with ${\boldmath $x$}$ = 0.44 studied by the Zero-field Muon-Spin-Relaxation (ZF-$\mu$SR) method (2007)

Suzuki, Takao, Yamada, Fumiko, Watanabe, Isao, Goto, Takayuki, Oosawa, Akira, Tanaka, Hidekazu

Zero-field muon-spin-relaxation (ZF-{\boldmath $\mu$}SR) measurements were carried out down to 80 mK on the randomness bond system Tl$_{1-x}$K$_x$CuCl$_3$ with $x$ = 0.44. Time spectra are well...

1H-NMR Study on the Magnetic Order in the Mixture of Two Spin Gap Systems (CH3)2CHNH3CuCl3 and (CH3)2CHNH3CuBr3 (2007)

Kanada, Keishi, Saito, Takehiro, Oosawa, Akira, Goto, Takayuki, Suzuki, Takao

The antiferromagnetic ordering in the solid-solution of the two spin-gap systems (CH3)2CHNH3CuCl3 and (CH3)2CHNH3CuBr3 has been investigated by 1H-NMR. The sample with the Cl-content ratio x=0.85...

Impurity-induced magnetic order in the mixture of two spin gap systems (CH3)2CHNH3CuCl3 and (CH3)2CHNH3CuBr3 (2006)

Kanada, Keishi, Saito, Takehiro, Oosawa, Akira, Goto, Takayuki, Suzuki, Takao, Manaka, Hirotaka

The ground state of the solid solution of the two spin gap systems (CH3)2CHNH3CuCl3 and (CH3)2CHNH3CuBr3 has been investigated by 1H-NMR. The existence of a magnetic ordering in the sample with the...

Pressure-Induced Magnetic Quantum Phase Transition in Gapped Spin System KCuCl3 (2006)

Goto, Kenji, Fujisawa, Masashi, Tanaka, Hidekazu, Uwatoko, Yoshiya, Oosawa, Akira, Osakabe, Toyotaka, ...

Magnetization and neutron elastic scattering measurements under a hydrostatic pressure were performed on KCuCl3, which is a three-dimensionally coupled spin dimer system with a gapped ground state....

High-field Magnetic Torque Measurements in (CH$_3$)$_2$CHNH$_3$CuCl$_3$ (2005)

Saito, Takehiro, Sasaki, Takahiko, Suzuki, Takao, Oosawa, Akira, Goto, Takayuki, Awaji, Satoshi, ...

High-field magnetic torque measurements were carried out in the spin gap system (CH$_3$)$_2$CHNH$_3$CuCl$_3$. It was observed that the magnitude of the magnetic torque $\tau$ is almost zero until the...

海洋自由論の研究(二) : フーゴー・グロティウスの「自由海論」について (1941)

大澤, 章, Oosawa, Akira, オオサワ, アキラ

三 「自由海論」の成立 四 その國際法上の意義 五 「自由海論」と戦争竝に中立 六 結語

海洋自由論の研究(一) : フーゴー・グロティウスの「自由海論」について (1941)

大澤, 章, Oosawa, Akira, オオサワ, アキラ

一 序言 二 グロティウスの生涯と業績

安全保障の地域的協定 (1935)

大澤, 章, Oosawa, Akira, オオサワ, アキラ

目次 一 安全保障の形態 二 地域的協定としてのロカルノ諸條約 三 安全保障機構に於ける其の地位 四 保障方法と制裁の問題

國際聯盟規約及び不戦條約に於ける戦争の地位 (1931)

大澤, 章, Oosawa, Akira, オオサワ, アキラ

(一) 國際法と戦争 (二) 國際聯盟規約に於ける戦争 (三) 不載條約に於ける戦争 (四) 平和的紛弔解決方法の統一的組織 (五)...