Pressure-induced change in the magnetic ordering of TbMnO3
Pressure-induced change in the magnetic ordering of TbMnO3
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DOI：
10.1103/physrevb.84.020408
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发表时间：
2011-07-20
影响因子：
3.7
通讯作者：
Forget, A.
中科院分区：
文献类型：
--
作者：
Makarova, O. L.;Mirebeau, I.;Forget, A.
我们用高压中子衍射法对TbMnO3进行了温度高达3.6 GPa，温度低至1.5 K的研究。Mn和Tb矩的不相称自旋结构在压力作用下被强烈抑制，Mn矩稳定为传播矢量为（0,1/2,0）的e型相称自旋结构。在低压或低温下，Mn和Tb的不相称阶数也会受到影响，相邻Mn链之间调制的相位变化以及Mn矩沿a轴的重新定向。结果表明，在压力作用下，不同Mn-Mn相互作用的平衡发生了变化，Tb-Tb（或Tb-Mn）相互作用增强。
We have studied TbMnO3 by high-pressure neutron diffraction up to 3.6 GPa and down to 1.5 K. The incommensurate spin structures of the Mn and Tb moments are strongly suppressed under pressure, and an E-type commensurate spin structure with (0,1/2,0) propagation vector is stabilized for the Mn moments. The Mn and Tb incommensurate orders which persist at low pressures or low temperatures are also affected, with a change of phase of the modulation between neighboring Mn chains and a reorientation of the Mn moments along the a axis. The results suggest both a change of the balance of the different Mn-Mn interactions and a strengthening of the Tb-Tb (or Tb-Mn) interactions under pressure.