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arXiv 1504.03003cond-mat.str-el
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{23} Na2Ni2TeO6的Na核自旋-晶格弛豫研究

{23}Na nuclear spin-lattice relaxation studies of Na2Ni2TeO6

Y. Itoh

摘要:

本文报道了用{23}Na核自旋回波技术对蜂窝晶格反铁磁体Na_2Ni_2 TeO_6的{23}Na核磁共振谱的研究。Na_2Ni_2 TeO_6和Na_2(Ni{0.5}Cu{0.5})_2 TeO_6的自旋-晶格弛豫速率分别为1/{23}T_1 = a(T/T_N - 1)^{-w}和1/{23}T_1,在Neel温度T_N = 26 K附近出现临界发散,临界区较窄,临界指数w = 0.34。虽然Na_2Ni_2 TeO_6的均匀磁化率在35 K处表现出低维自旋系统的宽的最大值,但NMR结果表明在Neel温度附近存在三维临界现象。

英文摘要:

We report on {23}Na NMR studies of a honeycomb lattice antiferromagnet Na2Ni2TeO6 by {23}Na nuclear spin-echo techniques. The {23}Na nuclear spin-lattice relaxation rate 1/{23}T_1 exhibits critical divergence near a Neel temperature T_N = 26 K, a narrow critical region, and a critical exponent w = 0.34 in 1/{23}T_1 = a (T/T_N - 1)^{-w} for Na2Ni2TeO6, and T_N = 18 K for Na2(Ni{0.5}Cu{0.5})2TeO6. Although the uniform magnetic susceptibility of Na2Ni2TeO6 exhibits a broad maximum at 35 K characteristic of low dimensional spin systems, the NMR results indicate three dimensional critical phenomenon around the Neel temperature.

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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