论文标题
SR取代的BA3-XSRXMNNB2O9（x = 1和3）中抑制远距离排序和多效性
Suppression of long-range ordering and multiferroicity in Sr-substituted Ba3-xSrxMnNb2O9 (x = 1 and 3)
论文作者
论文摘要
SR取代在有序的钙钛矿BA3-XSRXMNNB2O9（X = 1和3）中的效果已使用X射线衍射，磁化，介电/磁性和中子衍射测量结果进行了研究。已知具有较大自旋（S = 5/2）的母体化合物BA3MNNB2O9表现出具有准2D三角形晶格抗铁磁基态型II型多表情特性。由于在BA3-XSRXMNNB2O9（X = 1和3）中的A位点取代了较小的IsoLATEN离子而导致的交换相互作用的轻微扰动（X = 1和3）会极大地改变基态，因此多效性。各种波动（量子和/或热）的关键作用，由SR替代而引起的弱晶格失真以及在确定基态和多表皮上的不同波动之间的微小不平衡，并与较小的自旋化合物的结果进行了比较（S = 1/2或1）。
Effects of Sr substitution at A-site in ordered perovskite Ba3-xSrxMnNb2O9 (x = 1 and 3) have been investigated using X-ray diffraction, magnetization, dielectric/magnetodielectric and neutron diffraction measurements. The parent compound Ba3MnNb2O9 having a large spin (S=5/2) is known to exhibit type-II multiferroic properties with quasi 2D triangular lattice antiferromagnetic ground state. A slight perturbation in exchange interaction due to substitution of smaller size isovalent ion at the A-site in Ba3-xSrxMnNb2O9 (x = 1 and 3) has been found to alter the ground states drastically and hence the multiferroicity. The crucial role of various fluctuations (quantum and/or thermal), weak lattice distortion induced by Sr-substitution and slight imbalance between different fluctuations in determining the ground states and the multiferroicity is discussed and compared with the results of smaller spin compounds (S = 1/2 or 1).
