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Origin Of Multiferroic Spiral Spin Order In The Rmno_3 Perovskites

机译:Rmno_3钙钛矿中多铁螺旋自旋序的起源

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The origin of the spiral spin order in perovskite multiferroic manganites RMnO_3 (R=Tb or Dy) is here investigated using a two e_g-orbital double-exchange model. Our main result is that the experimentally observed spiral phase can be stabilized by introducing a relatively weak next-nearest-neighbor superexchange coupling (~10% of the nearest-neighbor superexchangc). Moreover, the Jahn-Teller lattice distortion is also shown to be essential to obtain a realistic spiral period. Supporting our conclusions, the generic phase diagram of undoped perovskite manganites is obtained using Monte Carlo simulations, showing phase transitions from the A-type antifcrromagnct, to the spiral phase, and finally to the E-type antiferromagnet, with decreasing size of the R ions. These results are qualitatively explained by the enhanced relative intensity of the superexchanges.
机译:本文使用两个e_g轨道双交换模型研究了钙钛矿多铁锰矿RMnO_3(R = Tb或Dy)中螺旋自旋次序的起源。我们的主要结果是,通过引入相对较弱的近邻超级交换耦合(约占最近邻超级交换的10%),可以稳定实验观察到的螺旋相位。此外,Jahn-Teller晶格畸变对于获得现实的螺旋周期也必不可少。支持我们的结论的是,使用蒙特卡洛模拟获得了未掺杂钙钛矿锰矿的一般相图,该相图显示了随着R离子尺寸的减小,从A型反铁磁到螺旋相,最后到E型反铁磁的相变。 。这些结果通过超交换的相对强度增强而得到定性解释。

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