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27 April 2024

» arxiv » 1309.5472

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Ground state of the spin-1/2 chain of green dioptase at high fields
Kazuki Matsui ; Masashi Fujisawa ; Kenta Hagiwara ; Yukihiro Hoshino ; Takayuki Goto ; Takahiko Sasaki ; Hidekazu Tanaka ; Susumu Okubo ; Hitoshi Ohta ;
Date:	21 Sep 2013
Abstract:	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.
Source:	arXiv, 1309.5472
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