Spin density wave in the strongly dimerized quasi-one-dimensional organic conductor (DMET-TTF)2AuBr2
Spin density wave in the strongly dimerized quasi-one-dimensional organic conductor (DMET-TTF)2AuBr2
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强二聚准一维有机导体 (DMET-TTF)2AuBr2 中的自旋密度波
DOI：
10.1103/physrevb.104.184409
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发表时间：
2021
影响因子：
3.7
通讯作者：
Nomura Kazushige
中科院分区：
文献类型：
--
作者：
Iida Youhei;Sawada Masashi;Sasaki Yoshiaki;Tsuchiya Tomoaki;Minamidate Takaaki;Matsunaga Noriaki;Kawamoto Atsushi;Nomura Kazushige
在常压下，对准一维有机导体进行了电阻率、磁化率和碳-13核磁共振（NMR）研究。电阻率测量结果显示，在大约160 K时，绝缘体具有广泛的最小值，在此温度以下的绝缘体行为和磁化率结果显示，在22 K时，绝缘体呈倾斜结构。在相同的温度下，与反铁磁（AFM）相关的温度依赖性有一个尖峰。随着核磁共振谱的剧烈分裂，发现转变，表明一个相称的AFM结构。根据超精细耦合常数张量和原子力显微镜相中内场的角依赖性，确定了磁矩的幅值为/分子。磁矩小表示AFM嵌套型，即相应的自旋密度波。从这种不稳定性可以推测出沿一维链的反铁磁有序。这种行为可以用一维DMET-TTF链的强二聚化来解释。
At ambient pressure, studies of resistivity, magnetic susceptibility, and carbon-13 nuclear magnetic resonance (NMR) were conducted on the quasi-one-dimensional organic conductor. Resistivity measurements showed a broad minimum at approximately 160 K, and the insulator behavior below this temperature and magnetic susceptibility results revealed a dip structure at 22 K. At the same temperature, a sharp peak in the temperature dependence ofassociated with the antiferromagnetic (AFM). transition was found, along with drastic splitting of the NMR spectra, indicating a commensurate AFM structure. The amplitude of the magnetic moments was determined to be/molecule from the hyperfine coupling constant tensor and the angular dependence of the internal field in the AFM phase. The small magnetic moment signifies the AFM nesting type, i.e., commensurate spin density wave. An antiferromagnetic ordering ofalong the one-dimensional chain is expected from theinstability. This behavior can be explained by the strong dimerization of the one-dimensional DMET-TTF chain.