论文标题
光电诱导的多效性TBMNO $ _3 $的结构动力学
Photoinduced structural dynamics of multiferroic TbMnO$_3$
论文作者
论文摘要
我们使用时间分辨的硬X射线衍射来研究低温抗抗铁磁性和铁电序相的多效绝缘子TBMNO $ _3 $的结构动力学。通过测量（0 2 4）和（1 3 -5）Bragg反射检测到1.55 eV的光激发后的晶格响应。看到0.02％的拉伸应变与表面正常，在20-30 ps之内出现。该瞬态应变的幅度比激光诱导的加热预测的数量级低，我们将其归因于电子和晶格子系统之间的能量转移的瓶颈。瞬态扩展的时间尺度与先前报道的电磁动力学的时间尺度一致。我们讨论了TBMNO $ _3 $中的结构和消灭动力学之间的可能关系，其中光诱导的原子运动调节了交换相互作用，从而导致系统中的磁顺序破坏。
We use time-resolved hard x-ray diffraction to investigate the structural dynamics of the multiferroic insulator TbMnO$_3$ in the low temperature antiferromagnetic and ferroelectrically ordered phase. The lattice response following photoexcitation at 1.55 eV is detected by measuring the (0 2 4) and (1 3 -5) Bragg reflections. A 0.02% tensile strain, normal to the surface, is seen to arise within 20 - 30 ps. The magnitude of this transient strain is over an order of magnitude lower than that predicted from laser-induced heating, which we attribute to a bottleneck in the energy transfer between the electronic and lattice subsystems. The timescale for the transient expansion is consistent with that of previously reported demagnetization dynamics. We discuss a possible relationship between structural and demagnetization dynamics in TbMnO$_3$, in which photoinduced atomic motion modulates the exchange interaction, leading to a destruction of the magnetic order in the system.
