Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
Initialising ...
柿本 和勇*; 高田 早紀*; 太田 寛人*; 原口 祐哉*; 萩原 雅人; 鳥居 周輝*; 神山 崇*; 三田村 裕幸*; 徳永 将史*; 畠山 温*; et al.
Journal of the Physical Society of Japan, 91(5), p.054704_1 - 054704_7, 2022/05
被引用回数:1 パーセンタイル:26.42(Physics, Multidisciplinary)The magnetism of AlFeGeO from to with the andalusite structure was examined. AlFeGeO at low temperatures was found to show a weak ferromagnet-like behavior for and a spin glass behavior for . The small spontaneous magnetization observed in the weak ferromagnet-like samples may be caused by the existence of Dzyaloshinsky-Moriya interaction and the difference in the magnitude of the magnetic moments of Fe in the octahedral and trigonal bipyramidal sites. The appearance of the spin glass behavior implies that the dilution of Fe ions by Al ions in AlFeGeO causes the competition between ferromagnetic and antiferromagnetic interactions. The dependence of the site occupancy of Fe ions suggests that FeGeO with the andalusite structure cannot be synthesized.
柿本 和勇*; 太田 寛人*; 原口 祐哉*; 萩原 雅人; 鳥居 周輝*; 神山 崇*; 香取 浩子*
Journal of the Physical Society of Japan, 91(5), p.054707_1 - 054707_9, 2022/05
被引用回数:0 パーセンタイル:0(Physics, Multidisciplinary)Neutron diffraction experiments on polycrystalline andalusite-type AlFeGeO with to were performed. The magnetic Bragg peaks with the propagation vector of = (0, 0.150(1), 0) for the sample with and = (0, 0.141(1), 0) for the sample with were observed, which means that an incommensurate magnetic order was realized for each sample. The calculation of the magnetic structure factors by the Pawley method and the analysis of the irreducible representations revealed that both samples have a magnetic structure in which the magnetic moments rotate in the crystallographic -plane with sinusoidal modulation along the -axis. By the Luttinger Tisza method, we determined the sign of the nearest-neighbor exchange interaction consists that reproduce the magnetic structure obtained by the irreducible representation analysis.