A CREATION OF A STRONGLY-CORELATED SPIN-CHARGE-LATTICE COUPLED METAL-COMPLEX SYSTEM

强相关自旋电荷晶格耦合金属络合物系统的创建

• 批准号: 14340215
• 负责人: KITAGAWA Hiroshi
• 金额: $ 8.38万
• 依托单位: KYUSHU UNIVERSITY (2003)University of Tsukuba (2002)
• 依托单位国家: 日本
• 项目类别: Grant-in-Aid for Scientific Research (B)
• 财政年份: 2002
• 资助国家: 日本
• 起止时间: 2002 至 2003
• 项目状态: 已结题
• 来源: https://kaken.nii.ac.jp/en/grant/KAKENHI-PROJECT-14340215/
• 关键词: Metal Complex; Spin-Charge cpoupling; Mixed Valency; Orbital Degree of Freedom; 磁場誘起効; 磁場誘起効果; 磁場誘起相転移; MMX-chain; スピン; 電荷秩序; 軌道秩序

We have focused on a one-dimensional metal-dimer system with dynamical spin-charge-lattice coupling, exhibiting many kinds of charge-ordered states associated with metal-insulator transitions. In this report, we present on an MMX-chain system in which there exists 1-D 【triple bond】-I-M-M-I-【triple bond】 chains. Some of the possible 1-D structural modes for the MMX chain are shown below.(1)【triple bond】M^<2.5+>-M^<2.5+>-X-M^<2.5+>-M^<2.5+>-X-M^<2.5+>-M^<2.5+>-X【triple bond】(2)【triple bond】M^<2+>-M^<2->-X-M^<3+>-M^<3+>-X-M^<2+>-M^<2+>-X-M^<3+>-M^<3+>-X【triple bond】(3)【triple bond】M^<2+>-M^<3+>-X-M^<2+>-M^<3+>-X-M^<2+>-M^<3+>-X-M^<2+>-M^<3+>-X【triple bond】(4)【triple bond】M^<2+>-M^<3+>-X-M^<3+>-M^<2+>-X-M^<2+>-M^<3+>-X-M^<3+>-M^<2+>-X【triple bond】According to our recent work, the Ni_2(MeCS_2)_4I salt was found to exhibit a field-induced phase transition accompanying a spin transition between a 1-D Heisenberg AF magnetic spin system with J 〜 -50 K (a-phase) and Curie spin system with J 〜 0 … More K (b-phase). In order to investigate two different spin state, several physical measurements were carried out on Ni_2(MeCS_2)_4I.It exhibits a semiconducting behavior in the temperature range of 180 - 370 K, which is consistent with a Mott-Hubbard insulator. The XPS spectra shows a trapped-valence state of +II and +III. Each phase is considered to have the 1-D structural mode of -I-Ni^<2+>-Ni^<3+>-I-Ni^<3+>-Ni^<2+>-I-Ni^<2.5+>-Ni^<2.5+>-I-, which was confirmed by Raman, IR, UV-VIS-NIR spectra and magnetic susceptibility.At 2 K, if the magnetic field of 5 T is applied, the a-phase is transformed to the b-phase, which can be obtained as a metastable state even at room temperature and zero-field. On the other hand, if the magnetic field of 5 T is applied at 300 K, the b-phase is reversibly transformed to the a-phase. This field-induced phenomenon is considered to be derived from an orbital degree of freedom, resulting the field-induced orbital ordering. Detailed investigations are in progress. Less

我们研究了具有自旋-电荷-晶格动力学耦合的一维金属-二聚体体系，该体系表现出多种与金属-绝缘体跃迁相关的电荷有序态。本文研究了一个存在一维三键-I-M-M-I-三键链的MMX-链体系。MMX链的一些可能的1-D结构模式如下所示。（1）[三键] M ^&lt;2.5 +&gt;-M ^&lt;2.5 +&gt;-X-M ^&lt;2.5 +&gt;-X-M ^&lt;2.5 +&gt;-M ^&lt;2.5 +&gt;-X [三键]（2）[三键] M ^&lt;2 +&gt;-M ^-X-M ^&lt;3 +&gt;-M ^&lt;3 +&gt;-X-M ^&lt;2 +&gt;-M ^&lt;2 +&gt;-X-M ^&lt;3 +&gt;-M ^&lt;3 +&gt;-X [三键]（3）[三键] M ^&lt;2 +&gt;-M ^&lt;3 +&gt;-X-M ^&lt;2 +&gt;-M ^&lt;3 +&gt;-X-M ^&lt;2 +&gt;-M ^&lt;3 +&gt;-X-M ^&lt;2 +&gt;-M ^&lt;3 +&gt;-X [三键]（4）[三键] M ^&lt;2 +&gt;-M ^&lt;3 +&gt;-X-M ^&lt;3 +&gt;-M ^&lt;2 +&gt;-X-M ^&lt;3 +&gt; <2->2 +&gt;-M ^&lt;3 +&gt;-X-M ^&lt;3 +&gt;-M ^&lt;2 +&gt;-X [三键]根据我们最近的工作，我们发现Ni_2（MeCS_2）_4I盐具有场致相变，并伴随着一维Heisenberg AF磁自旋系统（J =-50 K（α-相）和居里自旋系统（J =-0.50 K）之间的自旋跃迁 ...更多信息 K（b相）。为了研究Ni_2（MeCS_2）_4I的两种不同的自旋态，我们对它进行了物理测量，发现它在180 - 370 K的温度范围内表现出半导体性质，这与Mott-Hubbard绝缘体相一致。XPS谱图显示了+II和+III的捕获价态。通过拉曼光谱、红外光谱、紫外-可见-近红外光谱和磁化率分析，确定了各相具有-I-Ni ^&lt;2 +&gt;-Ni ^&lt;3 +&gt;-I-Ni ^&lt;2 +&gt;-I-Ni ^&lt;2.5 +&gt;-Ni ^&lt;2.5 +&gt;-I-的一维结构模式。其甚至在室温和零场下也可以作为亚稳态获得。另一方面，如果在300 K下施加5T的磁场，则b相可逆地转变为a相。这种场诱导现象被认为是来自轨道自由度，导致场诱导轨道有序。详细调查正在进行中。少

项目成果

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• 发表时间: 2004
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Novel Valence-Ordering Structures and Magnetic behavior of New Metailic MMX Chain Compounds

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• 发表时间: 2002
• 期刊: Angew.Chem.Int.Ed. 41
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Structural Phase Transition and Valence Fluctuation Observed in a New MMX Chain Compound, Pt_2(n-PrCS_2)_4I

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• 发表时间: 2002
• 期刊: Chemistry Letters
• 影响因子: 1.6
• 作者: M.Mitsumi;et al.
• 通讯作者: et al.

Y.Nagao, R.Ikeda, S.Kanda, H.Kitagawa: "Complex-Plane Impedance Study on A Hydrogen-Doped Copper Coordination Polymer : N, N'-bis-(2-hydroxy-ethyl)dithiooxamidatocopper(II)"Mol.Cryst.Liq.Cryst.. 379. 89-94 (2002)

Y.Nagao、R.Ikeda、S.Kanda、H.Kitakawa：“氢掺杂铜配位聚合物的复杂平面阻抗研究：N,N-双-(2-羟基乙基)二硫代草酰胺铜(II)”

Structure and Transport Properties of Isomer-Separated C82.

异构体分离的 C82 的结构和传输性质。

• 发表时间: 2004
• 期刊: Phys.Rev. B, 69
• 作者: Y.Kubozono;et al.
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