关于TiOX phase diagram的对称性研究
Symmetry disquisition on the TiOX phase diagram
摘要：
本文用非弹性光散射实验研究了准一维无机自旋-Peierls体系TiOX（TiOBr和TiOCl）的相变序列，特别是低温无公度相和自旋-Peierls相的对称性。反常的一阶特征的自旋Peierls相的转变被发现是一个后果的不同对称性的无公度和自旋Peierls（P $2_{1}/m$）相。最低转变温度的压力依赖性强烈表明，磁链间相互作用在形成自旋Peierls和无公度相中起着重要作用。最后，VOCl的TiOX光谱的拉曼数据的比较表明，以前观察到的高能量散射具有声子起源。
英文摘要：
The sequence of phase transitions and the symmetry of in particular the low temperature incommensurate and spin-Peierls phases of the quasi one-dimensional inorganic spin-Peierls system TiOX (TiOBr and TiOCl) have been studied using inelastic light scattering experiments. The anomalous first-order character of the transition to the spin-Peierls phase is found to be a consequence of the different symmetries of the incommensurate and spin-Peierls (P$2_{1}/m$) phases. The pressure dependence of the lowest transition temperature strongly suggests that magnetic interchain interactions play an important role in the formation of the spin-Peierls and the incommensurate phases. Finally, a comparison of Raman data on VOCl to the TiOX spectra shows that the high energy scattering observed previously has a phononic origin.
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