Quenching and Recovery of Spin in Quasi-One-dimensional Itinerant Electron Magnet LaMn4Al8
Quenching and Recovery of Spin in Quasi-One-dimensional Itinerant Electron Magnet LaMn4Al8
复制标题
准一维流动电磁体LaMn4Al8中自旋的淬灭与恢复
DOI：
10.1143/jpsj.74.1135
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发表时间：
2005
影响因子：
1.7
通讯作者：
T. Kohara
中科院分区：
文献类型：
--
作者：
Y. Muro;S. Giri;G. Motoyama;H. Nakamura;T. Kohara
研究了具有线性自旋链的三维重电子化合物LaMn4Al8的电子关联。与类似的化合物YMn4Al8一样，我们发现了磁化率随温度变化的极大值。这可以通过假设自旋激发谱中存在宽度为Δ≃280K的窄赝隙来解释，这导致了自旋在低温下的猝灭。磁化率、电阻率和热膨胀数据的异常，在大约50K以下观察到，尽管没有任何相变，表明在这个低温范围内自旋的恢复和短程磁关联的发展。这与YMn4Al8的情况形成了对比。尽管磁关联明显发展，但没有明显的长程有序，这可能是由于Mn自旋排列的一维性质所致。
The electron correlation in the 3d heavy-electron compound with linear spin chains, LaMn 4 Al 8 , has been investigated. Like a similar compound, YMn 4 Al 8 , we found a broad maximum in the temperature dependence of the susceptibility. This is interpreted by assuming the presence of a narrow pseudogap with the width Δ≃280 K in the spin excitation spectrum, which leads to the quenching of spin at low temperatures. Anomalies in susceptibility, resistivity and thermal expansion data, observed below approximately 50 K in spite of the absence of any phase transition, suggest the recovery of spin and the development of short-range magnetic correlation in this low-temperature range. This is in contrast to the case of YMn 4 Al 8 . No apparent long-range ordering in spite of the markedly developed magnetic correlation is probably due to the one-dimensional nature of the Mn spin arrangement.