Zhang Hao, Flacau Roxana, Du Xin, Manuel Pascal, Cong Junzhuang, Sun Young, Sun Junliang, Yang Sihai, Li Guobao, Liao Fuhui, Lin Jianhua
Beijing National Laboratory for Molecular Sciences, State Key Laboratory of Rare Earth Materials Chemistry and Applications, College of Chemistry and Molecular Engineering, Peking University, Beijing, 100871, P. R. China.
Canadian Neutron Beam Centre, Chalk River Laboratories, Chalk River, ON, K0J 1J0, Canada.
Chemphyschem. 2016 Apr 18;17(8):1098-103. doi: 10.1002/cphc.201501188. Epub 2016 Feb 11.
TbMnO3 is an important multiferroic material with strong coupling between magnetic and ferroelectric orderings. Incommensurate magnetic ordering is suggested to be vital for this coupling in TbMnO3 , which can be modified by doping at the site of Tb and/or Mn. Our study shows that a self-doped solid solution Tb1-x Mny MnO3 (y≤x) can be formed with Mn doped into the site of Tb of TbMnO3 . When y is small Tb1-x Mny MnO3 shows both ferroelectric and incommensurate magnetic orders at low temperature, which is similar to TbMnO3 . However, if y is large enough, a commensurate antiferromagnetic ordering appears along with the incommensurate magnetic ordering to prevent the appearance of multiferroicity in Tb1-x Mny MnO3 . That is to say, the magnetoeletric coupling can be broken by the co-existence of a commensurate antiferromagnetic ordering. This finding may be useful to the study of TbMnO3 .
TbMnO₃是一种重要的多铁性材料，其磁有序和铁电有序之间存在强耦合。非共线磁有序被认为对TbMnO₃中的这种耦合至关重要，它可以通过在Tb和/或Mn位点进行掺杂来改变。我们的研究表明，可以形成一种自掺杂固溶体Tb₁₋ₓMnyMnO₃（y≤x），其中Mn掺杂到TbMnO₃的Tb位点。当y较小时，Tb₁₋ₓMnyMnO₃在低温下同时表现出铁电和非共线磁有序，这与TbMnO₃相似。然而，如果y足够大，会出现共线反铁磁有序与非共线磁有序共存的情况，从而阻止Tb₁₋ₓMnyMnO₃中出现多铁性。也就是说，共线反铁磁有序的共存会破坏磁电耦合。这一发现可能对TbMnO₃的研究有用。
