Spin Fluctuations from Hertz to Terahertz on a Triangular Lattice
Spin Fluctuations from Hertz to Terahertz on a Triangular Lattice
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三角形晶格上从赫兹到太赫兹的自旋涨落
DOI：
10.1103/physrevlett.115.127202
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发表时间：
2015
期刊：
影响因子：
--
通讯作者：
and Collin Broholm
中科院分区：
文献类型：
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作者：
Yusuke Nambu;Jason S. Gardner;Douglas E. MacLaughlin;Chris Stock;Hitoshi Endo;Seth Jonas;Taku J. Sato;Satoru Nakatsuji;and Collin Broholm
利用超高分辨非弹性中子散射、介子自旋弛豫、交流磁化率和非线性磁化率测量，研究了13年来三角晶格反铁磁体的时间磁关联。与短程空间关联不同，时间关联的温度依赖性表现出明显的反常。自旋波动率在冷却后急剧下降，但在微秒时间尺度上的涨落仍然保持着反常的动力学区域。由于这个时间尺度比单点动力学的时间尺度高出6个数量级，这些波动证明了在短程相关的无公度状态下出现的自由度。
The temporal magnetic correlations of the triangular-lattice antiferromagnetare examined through 13 decades () using ultrahigh-resolution inelastic neutron scattering, muon spin relaxation, and ac and nonlinear susceptibility measurements. Unlike the short-rangedspatialcorrelations, the temperature dependence of thetemporalcorrelations show distinct anomalies. The spin fluctuation rate decreases precipitously upon cooling towards, but fluctuations on the microsecond time scale then persist in an anomalous dynamical regime for. As this time scale exceeds that of single-site dynamics by 6 orders of magnitude, these fluctuations bear evidence of emergent degrees of freedom within the short-range correlated incommensurate state of.