Abstract
The Jahn—Teller distortion plays an important role in determining the exchange interaction in rare-earth manganites. In this work we study the influence of the Jahn—Teller distortion on the magnetic structures of TbMn1−xFexO3 (x = 0, 0.02, 0.05, 0.10, and 0.20) single crystals in the basal MnO2 plane. The decrease in the quadruple splitting with the increasing Fe doping indicates the reduction of the Jahn—Teller distortion, which makes the nearest neighboring (NN) FM interaction dominant over the next nearest neighbor (NNN) AFM interaction. This alteration is favorable for the development of A-type AFM ordering instead of the spiral magnetic ordering, which collapses when x ≥ 0.05. The analysis of dielectric data indicates that the ferroelectricity is arising from the peculiar spiral magnetic ordering.
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