Simultaneous ordering of holes and spins in La2NiO4.125.
Simultaneous ordering of holes and spins in La2NiO4.125.
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DOI：
10.1103/physrevlett.73.1003
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发表时间：
1994-08
影响因子：
8.6
通讯作者：
J. Tranquada;D. Buttrey;V. Sachan;J. Lorenzo
中科院分区：
文献类型：
--
作者：
J. Tranquada;D. Buttrey;V. Sachan;J. Lorenzo
本文报道了110 K以下La[sub 2]NiO[sub 4.125]中无公度磁有序的单晶中子衍射研究。除了第一和第三谐波的磁性布拉格峰，我们还观察到与电荷有序相关的第二谐波峰。无公度分裂的大小[1]与温度密切相关。锁定的行为表明[]倾向于有理分数，而连续变化的区域则表明魔鬼的楼梯。这些功能的分析表明，空穴，诱导过剩的氧，在畴壁，形成反铁磁畴之间的反相边界的顺序。
We report a single-crystal neutron diffraction study of the incommensurate magnetic ordering that occurs in La[sub 2]NiO[sub 4.125] below 110 K. Besides the magnetic first and third harmonic Bragg peaks, we have also observed second harmonic peaks associated with charge ordering. The magnitude of the incommensurate splitting, [epsilon], is strongly temperature dependent. Lock-in behavior indicates that [epsilon] tends to rational fractions, while regions of continuous variation suggest a devil's staircase. Analysis of these features indicates that the holes, induced by the excess oxygen, order in domain walls that form antiphase boundaries between antiferromagnetic domains.