Magnetic Structure of YBaCo4O7 with Kagome- and Triangular-Lattices
Magnetic Structure of YBaCo4O7 with Kagome- and Triangular-Lattices
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DOI：
10.1143/jpsj.75.054707
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发表时间：
2006-01
期刊：
影响因子：
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通讯作者：
M. Soda;Y. Yasui;T. Moyoshi;M. Sato;N. Igawa;K. Kakurai
中科院分区：
文献类型：
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作者：
M. Soda;Y. Yasui;T. Moyoshi;M. Sato;N. Igawa;K. Kakurai
在10 K ~ 130 K温度范围内对YBaCo_4 O_7单晶进行了中子衍射研究。YBaCo_4 O_7单晶沿着c轴方向具有kagome和三角形晶格的CoO_4四面体。在Tc 1 ~70 K和Tc 2 ~105 K两个温度范围内发现了结构转变。随着T的降低，磁序出现沿着与过渡在Tc 2，但它没有增长到一个理想的长程有序，即使在最低的T研究（~10 K）。在倒易空间中分别观察到两组磁漫反射，它们分别来自于戈薇晶格和三角晶格的Co矩。随着T的进一步降低，这两个强度的增长率被Tc 1处的另一个跃迁所增强。这些磁行为似乎与几何阻挫的释放有关。在10 K，磁短程有序的模式已被确定为两个网站的戈薇和三角晶格。
Neutron diffraction studies have been carried out in the temperature(T) range between 10 K and 130 K on a single crystal of YBaCo4O7, which has the stacking of kagome and triangular lattices of CoO4 tetrahedra along the c-axis. Structural transitions have been found at two temperatures Tc1~70 K and Tc2~105 K. With decreasing T, magnetic order appears along with the transition at Tc2, but it does not grow to an ideal long-range order even at the lowest T studied (~10 K). Two groups of magnetic diffuse reflections, which originate from the Co-moments of the kagome and triangular lattices, are observed separately in the reciprocal space. With further decreasing T, the growth rates of the intensities of these two are enhanced by another transition at Tc1. These magnetic behaviors seem to be related to the release of the geometrical frustration. At 10 K, the patterns of the magnetic short-range order have been determined for both sites of the kagome and triangular lattices.