Ground state of the spin-1/2 chain of green dioptase at high fields
Ground state of the spin-1/2 chain of green dioptase at high fields
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DOI：
10.7566/jpscp.3.014011
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发表时间：
2013-09
期刊：
影响因子：
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通讯作者：
K. Matsui;M. Fujisawa;K. Hagiwara;Y. Hoshino;T. Goto;Takahiko Sasaki;Hidekazu Tanaka;S. Okubo;H. Ohta
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文献类型：
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作者：
K. Matsui;M. Fujisawa;K. Hagiwara;Y. Hoshino;T. Goto;Takahiko Sasaki;Hidekazu Tanaka;S. Okubo;H. Ohta
宝石型透辉石Cu 6Si 6 O 18.6H2O具有由Cu-3d自旋组成的等边三角螺旋的手性晶体结构。在零场下，TN = 15.5 K时，样品的磁化强度沿c轴沿着为反铁磁有序，而沿c轴沿着磁场方向施加磁场时，样品的磁化强度在HC = 13.5 T时出现跳跃.通过~（29）Si-NMR测量，我们揭示了高场态本质上是两个亚晶格结构，ab面内的分量是共线的。结果表明，这与螺旋自旋链的几何模式没有明显的匹配。
The gem-stone dioptase Cu6Si6O18.6H2O has a chiral crystal structure of equilateral triangular helices consisting of Cu-3d spins. It shows an antiferromagnetic order with an easy axis along c at TN = 15.5 K under zero field, and a magnetization jump at HC = 13.5 T when the field is applied along c-axis. By 29Si-NMR measurements, we have revealed that the high-field state is essentially the two sub-lattice structure, and that the component within ab-plane is collinear. The result indicates no apparent match with the geometrical pattern of helical spin chain.