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arXiv 0802.3989cond-mat.str-elcond-mat.mtrl-sci
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NiGa_2S_4中Berezinskiii-Kosterlitz-nitrless相变的模型研究

Modelling the Berezinskii-Kosterlitz-Thouless Transition in the NiGa_2S_4

Chyh-Hong Chern

摘要:

在二维超流中,涡旋和反涡旋的扩散导致了一类新的相变--Berezinskiii-Kosterlitz-无涡旋(BKT)相变。这类相变在二维磁系统中也是可以预见的。然而,它在实际磁系统中的存在仍然是个谜。本文提出一个唯象模型来说明最近在NiGa_2S_4化合物的NMR实验中发现的新的自旋冻结跃迁是BKT型的。在NiGa_2S_4中观察到的自旋冻结态具有幂律衰减的自旋关联。

英文摘要:

In the two-dimensional superfluidity, the proliferation of the vortices and the anti-vortices results in a new class of phase transition, Berezinskii-Kosterlitz-Thouless (BKT) transition. This class of the phase transitions is also anticipated in the two-dimensional magnetic systems. However, its existence in the real magnetic systems still remains mysterious. Here we propose a phenomenological model to illustrate that the novel spin-freezing transition recently uncovered in the NMR experiment on the NiGa_2S_4 compound is the BKT-type. The novel spin-freezing state observed in the NiGa_2S_4 possesses the power-law decayed spin correlation.

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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