Proton NMR Study of Atacamite Cu2Cl(OH)3
Proton NMR Study of Atacamite Cu2Cl(OH)3
复制标题
氯铜矿 Cu2Cl(OH)3 的质子核磁共振研究
DOI：
10.7566/jpsj.82.084707
复制
发表时间：
2013
影响因子：
1.7
通讯作者：
M. Matsumura
中科院分区：
文献类型：
--
作者：
K. Zenmyo;H. Kubo;M. Tokita;T. Hamasaki;M. Hagihala;Xufeng Zheng;T. Kawae;Yuuki Takeuchi;M. Matsumura
Cu2Cl(OH)3在低温零外加场下的质子核磁共振谱有两个尖峰。这一结果意味着大多数磁矩在低温下呈反铁磁有序。通过将观测到的质子核磁共振谱与几种磁模型中数值计算的谱进行比较确定的磁结构表明，磁矩顺序为“全进全出”，朝向体中心。该磁性结构与反铁磁性烧绿石类似，但具有几何挫败性，与氯铜矿Mn2Cl(OH)3 的磁性结构不同，但具有相同的晶体结构。 Cu(I) 的磁矩大小为 1.12 \(\mu_{\text{B}}\) 和 Cu(II) 0.25 \(\mu_{\text{B}}\)。随着温度的升高，偏离“全进全出”方向的力矩数量变大。然而，从观察到的核磁共振谱中没有检测到无序或自旋玻璃矩的明确证据。
The proton NMR spectrum of Cu2Cl(OH)3 at low temperature in zero applied field has two sharp peaks. This result means that the majority of magnetic moments order antiferromagnetically at low temperature. The magnetic structure determined by comparing the observed proton NMR spectrum with the numerical calculated ones in several magnetic models shows that the magnetic moments order “all-in all-out” orienting to body center. This magnetic structure is similar to antiferromagnetic pyrochlore with geometric frustration, and different from the one of atacamite Mn2Cl(OH)3, though having the same crystal structure. The magnitude of magnetic moments of Cu(I) is 1.12 \(\mu_{\text{B}}\) and Cu(II) 0.25 \(\mu_{\text{B}}\). In increasing temperature, the number of moments deviated from “all-in all-out” directions becomes large. However, the clear evidence of the disordering or spin-glass moments is not detected from observed NMR spectrum.