arXivDaily arXiv每日学术速递 周一至周五更新
arXiv 1012.1493cond-mat.str-el
收藏

蜂窝晶格反铁磁体InCu2/3V1/3O3中高频ESR观测的反常自旋动力学

Anomalous Spin Dynamics observed by High Frequency ESR in Honeycomb Lattice Antiferromagnet InCu2/3V1/3O3

Susumu Okubo, Hideo Wada, Hitoshi Ohta, Takahiro Tomita, Masashi Fujisawa, Takahiro Sakurai, Eiji Ohmichi, Hikomitsu Kikuchi

摘要:

本文报道了S=1/2海森堡六角反铁磁体InCu_(2/3)V_(1/3)O_3的高频ESR研究结果。这种化合物似乎是一种罕见的模型物质的蜂窝晶格反铁磁体非常弱的层间耦合。高温磁化率可以用S=1/2蜂窝晶格反铁磁体来解释,在TN=38 K时呈现类磁序异常。虽然,我们的高频ESR的共振场显示出典型的反铁磁共振行为,我们的高频ESR的线宽继续增加低于TN,而它往往会随着温度在传统的三维反铁磁降低。一般来说,蜂窝晶格反铁磁体在理论上应该表现出与正方晶格反铁磁体类似的简单反铁磁序,因为这两种反铁磁体都是二分晶格。然而,我们认为,观察到的异常自旋动力学低于TN的蜂窝晶格反铁磁体,是没有观察到的正方形晶格反铁磁体的特有功能。

英文摘要:

High-frequency ESR results on the S=1/2 Heisenberg hexagonal antiferromagnet InCu2/3V1/3O3 are reported. This compound appears to be a rare model substance for the honeycomb lattice antiferromagnet with very weak interlayer couplings. The high-temperature magnetic susceptibility can be interpreted by the S=1/2 honeycomb lattice antiferromagnet, and it shows a magnetic-order-like anomaly at TN=38 K. Although, the resonance field of our high-frequency ESR shows the typical behavior of the antiferromagnetic resonance, the linewidth of our high-frequency ESR continues to increase below TN, while it tends to decrease as the temperature in a conventional three-dimensional antiferromagnet decreases. In general, a honeycomb lattice antiferromagnet is expected to show a simple antiferromagnetic order similar to that of a square lattice antiferromagnet theoretically because both antiferromagnets are bipartite lattices. However, we suggest that the observed anomalous spin dynamics below TN is the peculiar feature of the honeycomb lattice antiferromagnet that is not observed in the square lattice antiferromagnet.

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。

↑