Halperin-Saslow modes as the origin of the low-temperature anomaly in NiGa 2 S 4
Halperin-Saslow modes as the origin of the low-temperature anomaly in NiGa 2 S 4
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Halperin-Saslow 模式是 NiGa 2 S 4 低温异常的根源
DOI：
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发表时间：
2008
期刊：
影响因子：
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通讯作者：
Yong Baek Kim
中科院分区：
文献类型：
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作者：
D. Podolsky;Yong Baek Kim
三角晶格自旋1反铁磁体中不存在磁性长程有序[S.Nakatsuji等人]。科学309,1697(2005)]促使人们寻找一种新的量子基态。特别是，一些实验表明，尽管没有长程磁序，但存在线性弥散模式。我们发现，晶体的反常低温性质可以用Halperin和Saslow[Phys]的公式来解释。Rev.B16,2154(1977)]在冻结的自旋矩和零净磁化强度的背景下，可能存在线性色散Halperin-Saslow模。我们提供了对现有实验数据的一致性检查，并建议未来的实验可以进一步证实Halperin-Saslow模式的存在。我们的结果对这种材料的任何微观理论都有重要的限制。
The absence of magnetic long-range order in the triangular lattice spin-1 antiferromagnet ${ ext{NiGa}}_{2}{ ext{S}}_{4}$ [S. Nakatsuji et al. Science 309, 1697 (2005)] has prompted the search for a novel quantum ground state. In particular, several experiments suggest the presence of a linearly dispersing mode despite no long-range magnetic order. We show that the anomalous low-temperature properties of ${ ext{NiGa}}_{2}{ ext{S}}_{4}$ can naturally be explained by the formulation developed by Halperin and Saslow [Phys. Rev. B 16, 2154 (1977)] where the linearly dispersing Halperin-Saslow mode may exist in the background of frozen spin moments and zero net magnetization. We provide consistency checks on the existing experimental data and suggest future experiments that can further confirm the existence of the Halperin-Saslow mode. Our results place important constraints on any microscopic theory of this material.