Short-range spin correlations in β"-LiFeO2 from bulk magnetization, neutron diffraction, and μSR experiments
Short-range spin correlations in β"-LiFeO2 from bulk magnetization, neutron diffraction, and μSR experiments
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DOI：
10.1103/physrevb.81.024404
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发表时间：
2010-01-01
影响因子：
3.7
通讯作者：
Sato, Taku J.
中科院分区：
文献类型：
--
作者：
Akiyama, Ryota;Ikedo, Yutaka;Sato, Taku J.
体磁化，中子衍射，和μ子自旋旋转/弛豫（mu + SR）的测量已被执行，以研究在β ""-LiFeO 2的磁有序行为。在室温下，观察到铁原子的结构短程有序，相关长度大致对应于铁原子间的距离。体磁化强度、mu + SR和中子衍射都表明β "-LiFeO2在110 <T <170 K范围内类似于超顺磁体，这可能是由于形成了可归因于原子短程有序的小自旋团簇。在较低的温度下，μ子进动频率以及中子漫散射强度的逐渐增加，观察到低于110 K，表明集群间的相关性的发展。虽然在mu + SR结果中检测到了大量的磁有序，但中子衍射得出结论，团簇间的相关性肯定是短程的;相关长度估计为xi（s）约为14埃，几乎与温度无关。
Bulk magnetization, neutron-diffraction, and muon-spin-rotation/relaxation (mu+SR) measurements have been performed to study magnetic ordering behavior in beta ''-LiFeO2. At room temperature, structural short-range order of Fe atoms was observed with correlation length roughly corresponding to inter-Fe distance. Bulk magnetization, mu+SR and neutron diffraction all suggest that beta ''-LiFeO2 is similar to a superparamagnet in the range 110 < T < 170 K, possibly due to the formation of small spin clusters attributable to atomic short-range order. At lower temperatures, gradual increase in the muon precession frequency as well as the neutron diffuse scattering intensity were observed below 110 K, indicating development of intercluster correlations. While a bulk magnetic ordering was detected in the mu+SR results, neutron diffraction concludes that the intercluster correlations are definitely short ranged; the correlation length was estimated as xi(s) approximate to 14 angstrom, which is almost temperature independent.