Experimental investigation of quantum phase transition on one-dimensional spin gapped system

一维自旋带隙体系量子相变的实验研究

• 批准号: 17540331
• 负责人: HITAKA Masako
• 金额: $ 2.24万
• 依托单位: KYUSHU UNIVERCITY
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (C)
• 财政年份: 2005
• 资助国家: 日本
• 起止时间: 2005 至 2006
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-17540331/
• 关键词: spin gap; one-dimensional Heisenberg spin; antiferromagnetic spin chain; low temperature and high field; field induced phase transition; Tomonaga-Luttinger liquid; F_5PNN; DMACuCl_3; 一次元ハイゼンベルグ系; 極低温・磁場中比熱測定

We have studied a typical S=1/2 Heisenberg alternating spin chain system ; pentafulorophenyl nitronyl nitroxide (F_5PNN) and a novel magnetic system with two critical field regios ; (CH_3)_2NH_2CuCl_3 (DMACuCl_3) to investigate field induced phase transitions and Tomonaga-Luttinger liquid phase in spin-gapped system.In F_5PNN, we found a field induced magnetic ordering between Hc1=3T and Hc2=6.5T below T=250mK. Characteristic behaviors are observed depending on the magnetic field up to above Hc2 outside of the H-T phase boundary for the field induced phase. The temperature and field dependence of the specific heat are qualitatively in good agreement with the theoretical calculation on an S=1/2 spin gapped system.In DMACuCl_3,a spontaneous magnetic ordering is observed below Hc1=2T, while no magnetic ordering is in the 1/2 magnetization plateau field region from Hc1=2T to Hc2 =3.5T. A field induced magnetic ordering emerges above Hc2=3.5T, which grows with increasing magnetic field up to H=8T.

我们研究了一个典型的S=1/2海森堡交替自旋链系统：五氟苯基硝酰基氮氧化物（F_5PNN）和一个具有两个临界场区的新磁系统;（CH_3）_2NH_2CuCl_3（DMACuCl_3）研究了自旋能隙体系的场致相变和Tomonaga-Luttinger液相。在T= 250 mK以下，我们发现了一个在Hc_1 = 3 T和Hc_2 =6.5T之间的场致磁有序。观察到的特征行为取决于磁场Hc 2以上的H-T相边界外的场诱导相。比热随温度和磁场的变化与S=1/2自旋能隙系统的理论计算结果定性一致，DMACuCl_3在低于Hc_1 = 2 T时观察到自发磁有序，而在Hc_1 = 2 T到Hc_2 =3.5T的1/2磁化平台区没有磁有序.磁场诱导的磁有序在H_c ~ 2 =3.5T以上出现，并随着磁场的增加而增加，直到H= 8 T。

项目成果

Magnetic ordering in a genuine organic crystal with triangular antiferromagnetic spin units

• DOI: 10.1103/physrevb.72.024435
• 发表时间: 2005-07
• 期刊: Physical Review B
• 影响因子: 3.7
• 作者: K. Takeda*;Y. Yoshida;Y. Inanaga;T. Kawae;D. Shiomi;T. Ise;M. Kozaki;K. Okada;Kazunobu Sato;T. Takui

Molecular Field and Monte Carlo Study for the Mixed-Spin Axial Next-Nearest-Neighbor Ising Model

混合自旋轴向次近邻伊辛模型的分子场和蒙特卡罗研究

• 发表时间: 2006
• 期刊: Phys.Rev.B 73
• 作者: T.Kasama;Y.Muraoka;T.Idogaki
• 通讯作者: T.Idogaki

Specific Heat Study of an S=1/2 Alternating Heisenberg Spin Chain System : F_5PNN in a Magnetic Field

S=1/2 交替海森堡自旋链系统的比热研究：磁场中的 F_5PNN

• 发表时间: 2005
• 期刊: Physical Review Letters 94
• 作者: Y.Yoshida;N.Tateiwa;M.Mito;T.Kawae 他
• 通讯作者: T.Kawae 他

Specific Heat Study on a Novel Spin-Gapped System : (CH3)2NH2CuCl3

新型自旋间隙体系的比热研究：(CH3)2NH2CuCl3

• 发表时间: 2005
• 期刊: Journal of the Physical Society of Japan 74巻・11号
• 作者: S.Masaki;T.Mito;S.Wada;N.Takeda;D.Kikuchi;H.Sato;H.Sugawara;Guo-qing Zheng;Y.Yoshida et al.
• 通讯作者: Y.Yoshida et al.

Coexistence of long-range order and spin fluctuation in geometrically frustrated clinoatacamite Cu2Cl(OH)3.

• DOI: 10.1103/physrevlett.95.057201
• 发表时间: 2005-07
• 期刊: Physical review letters
• 影响因子: 8.6
• 作者: X. G. Zheng;H. Kubozono;K. Nishiyama;W. Higemoto;T. Kawae;A. Koda;C. N. Xu