Critical spin dynamics in the antiferromagnet La4Ni 3O8 from La139 nuclear magnetic resonance
Critical spin dynamics in the antiferromagnet La4Ni 3O8 from La139 nuclear magnetic resonance
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DOI：
10.1103/physrevb.83.014402
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发表时间：
2011-01
影响因子：
3.7
通讯作者：
N. apRoberts-Warren;A. Dioguardi;V. Poltavets;M. Greenblatt;P. Klavins;N. Curro
中科院分区：
文献类型：
--
作者：
N. apRoberts-Warren;A. Dioguardi;V. Poltavets;M. Greenblatt;P. Klavins;N. Curro
我们报告的核磁共振数据表明，存在反铁磁秩序低于K。这种引人注目的化合物含有二维（2D）层，具有不寻常的Ni价态。具有反铁磁自旋顺序，类似于铜酸盐超导体的母体化合物。我们的数据清楚地揭示了戏剧性的光谱变化和低能量反铁磁的相关性与以下的长程有序的发病。然而，这些临界自旋波动，不发散在第二阶相变，而是出现与atransition特性的2D自旋波动。
We reportnuclear magnetic resonance data inthat reveal the presence of antiferromagnetic order belowK. This remarkable compound contains two-dimensional (2D) layers ofwith unusual Ni valences., with antiferromagnetic order ofspins, is analogous to the parent compounds of the cuprate superconductors. Our data clearly reveal dramatic spectral changes and low-energy antiferromagnetic correlations associated with the onset of long-range order below. These critical spin fluctuations, however, do not diverge at the second-order phase transition but rather appear to be associated with atransition characteristic of 2D spin fluctuations.