Abstract
As a part of studies of the microscopic behavior of spins in a mixed compound with competing exchange interactions Fe x Mn1−x TiO3, the Mössbauer technique has been applied to the samples withx=0.05, 0.10 and 0.20 which establish the antiferromagnetic long-range order at the respectiveT N's and do not show reentrant transitions at lower temperatures. We have found that in each of the three samples, the paramagnetic doublet superimposes on the magnetically split spectrum belowT N. The peak intensity of the paramagnetic doublet decreases with decreasing temperature and the paramagnetic doublet becomes undetected as sharp peaks at a temperature aroundT N/2. However, the spectra observed at temperatures lower thanT N/2 suggest that the paramagnetic doublet still exists, though it is highly broadened. This is interpreted as that short-range clusters of spins fluctuating rather slowly with time coexist with the spins forming the antiferromagnetic long-range order. We consider that these short-range clusters are responsible for the existence of the paramagnetic component contributing to the magnetization versus temperature curve.
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A. Ito, H. Aruga, M. Kikuchi, Y. Syono and H. Takei, Solid State Commun. 66(1988)475.
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Oyama, C., Morimoto, S. & Ito, A. Mössbauer study of paramagnetic-like behavior below the Néel temperature in a random mixture Fe x Mn1−x TiO3 withx<0.3. Hyperfine Interact 84, 183–186 (1994). https://doi.org/10.1007/BF02060661
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DOI: https://doi.org/10.1007/BF02060661