Abstract
A series of manganites Tb1−x Ho x MnO3 (0≤x≤0.6) with orthorhombic structure are synthesized and detailed investigations on their multiferroicity are performed. Successive magnetic transitions upon temperature variation are evidenced for all the samples, and both the Mn3+spiral spin ordering and rare-earth spin ordering are suppressed with increasing x. A significant enhancement of both the polarization and magnetoelectric response within 0.2<x<0.4 is observed, which may probably result from the shortening of the spiral-spin-ordering period, due to the competition between the spiral spin order and E-type antiferromagnetic order. This argument is supported by further theoretical calculations based on the two e g -orbital double-exchange model.
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Lu, C.L., Dong, S., Wang, K.F. et al. Enhanced polarization and magnetoelectric response in Tb1−x Ho x MnO3 . Appl. Phys. A 99, 323–331 (2010). https://doi.org/10.1007/s00339-009-5535-1
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DOI: https://doi.org/10.1007/s00339-009-5535-1