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arXiv 0906.4856cond-mat.str-el
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二维自旋阻挫体系Ni $_{5}$(TeO $_{3}$)$_{4}$ X $_{2}$(X = Br和Cl)的高场磁化强度

High-field magnetization of a two dimensional spin frustration system Ni$_{5}$(TeO$_{3}$)$_{4}$X$_{2}$ (X = Br and Cl)

J. L. Her, Y. H. Matsuda, K. Suga, K. Kindo, S. Takeyama, H. Berger, H. D. Yang

摘要:

用脉冲磁铁测量了Ni-$_{5}$(TeO-$_{3}$)-$_{4}$-X-$_{2}$(X = Br和Cl)的高场磁化强度M($H$)。这些化合物具有二维晶体结构和由Ni $\textbf{S}$($\textbf{S}$ = 1)离子构筑的扭曲的kagome自旋阻挫体系。X = Br和Cl的Néel转变温度分别为$T_{N} \sim$ 28和23 K。当X = Br和Cl时,在$H_{c} \sim$ 11和10 T处分别观察到一个台阶状的跃迁.另一方面,在$T > T_{N}$,场依赖磁化曲线表现为单调增加的直线,直到55 T。的$H_{c}$值是接近以前的自旋共振研究中,自旋翻转的情况下,提出了一个模型来解释场依赖的共振谱所获得的。他们的模型预测在23 T附近会发生进一步的跃迁,然而,我们的观测结果在55 T之前没有显示出任何平台行为,饱和或其他异常,这表明进一步的跃迁可能存在于更高的场区域。

英文摘要:

High-field magnetization, M($H$), on Ni$_{5}$(TeO$_{3}$)$_{4}$X$_{2}$ (X = Br and Cl) were measured by using a pulse magnet. These compounds have a two dimensional crystal structure and a distorted kagome spin frustrated system which is builded by the Ni$^{2+}$ ions ($\textbf{S}$ = 1). The Néel transition temperatures are $T_{N} \sim$ 28 and 23 K for X = Br and Cl, respectively. When $T < T_{N}$, we observed a step-like transition at $H_{c} \sim$ 11 and 10 T for X = Br and Cl, respectively. On the other hand, at $T > T_{N}$, the field-dependent magnetization curves behaved like a monotonically increasing straight line up to 55 T. The $H_{c}$ value is close to those obtained by previous spin resonance studies in which a model of spin-flop scenario was proposed to explain the field-dependent resonance spectra. Their model predicts a further transition at around 23 T, however, our observations did not show any plateau behaviors, saturation or other anomalies up to 55 T, suggesting that the further transition possibly exists at a much higher field region.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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