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首页> 外文期刊>Physical review >Structural domain and finite-size effects of the antiferromagnetic S = 1/2 honeycomb lattice in InCu_(2/3)V_(1/3)O_3
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Structural domain and finite-size effects of the antiferromagnetic S = 1/2 honeycomb lattice in InCu_(2/3)V_(1/3)O_3

机译：InCu_（2/3）V_（1/3）O_3中反铁磁S = 1/2蜂窝晶格的结构域和有限尺寸效应

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摘要

The compound InCu_(2/3)V_(1/3)O_3 has been studied by spectroscopy in the IR, near-infrared, and visible regions. X-ray and neutron diffraction indicate two-dimensional (2D) structural order of magnetic Cu~(2+) (5=1/2) ions on a honeycomb lattice with nonmagnetic V~(5+) ions complementing the hexagonal layer. Superstructure reflections observed by neutron diffraction reveal the presence of this 2D structural Cu/V order in domains of approximately 300 A with a disordered stacking along the c axis. Specific-heat, thermal-expansion, and neutron-diffraction experiments gave no signs of a three-dimensional long-range magnetic order. Strong 2D magnetic correlations seem to persist down to low temperatures, providing evidence of an incipient Neel-type ground state on this hitherto rarely studied lattice geometry in InCu_(2/3)V_(1/3)O_3. Magnetic correlations in these structural domains are compared with continuous time quantum-Monte Carlo calculations of the specific heat and in particular of the spin-spin-correlation length.
机译：化合物InCu_（2/3）V_（1/3）O_3已通过光谱在红外，近红外和可见光区域进行了研究。 X射线和中子衍射表明蜂窝状晶格上的磁性Cu〜（2+）（5 = 1/2）离子的二维（2D）结构顺序，非磁性V〜（5+）离子与六边形层互补。通过中子衍射观察到的超结构反射揭示了该2D结构Cu / V阶在c轴上无序堆积的大约300 A区域中的存在。比热，热膨胀和中子衍射实验没有给出三维远距离磁阶的迹象。强大的2D磁性相关性似乎一直持续到低温，这提供了在迄今很少研究的InCu_（2/3）V_（1/3）O_3晶格几何结构上出现初期Neel型基态的证据。将这些结构域中的磁相关性与比热，特别是自旋-自旋相关长度的连续时间量子蒙特卡罗计算进行了比较。

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