One-dimensional versus two-dimensional correlation effects in the oxyhalides TiOCl and TiOBr
One-dimensional versus two-dimensional correlation effects in the oxyhalides TiOCl and TiOBr
复制标题
卤氧化物 TiOCl 和 TiOBr 中的一维与二维相关效应
DOI：
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发表时间：
2006
期刊：
影响因子：
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通讯作者：
R. Claessen
中科院分区：
文献类型：
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作者：
M. Hoinkis;M. Sing;S. Glawion;L. Pisani;R. Valentí;S. Smaalen;M. Klemm;S. Horn;R. Claessen
本文利用光电子能谱和密度泛函方法对自旋Peierls体系TiOCl和TiOBr的电子结构进行了比较研究。虽然这些同构化合物的整体电子结构在性质上是相似的，但溴化物似乎不是一维的。我们提出了一个定量分析的实验色散的交换常数$J$和跳跃积分$t$，以及讨论的定性光谱特征。从这一点，我们得出结论，尽管一维物理触发的基态在这两种化合物，正常状态的电子结构的适当的描述，必须考虑到各向异性的受抑链间相互作用的基础上的三角晶格。
We have performed a comparative study of the electronic structures of the spin-Peierls systems TiOCl and TiOBr by means of photoemission spectroscopy and density-functional calculations. While the overall electronic structure of these isostructural compounds is qualitatively similar, the bromide appears to be less one-dimensional. We present a quantitative analysis of the experimental dispersions in terms of exchange constant $J$ and hopping integral $t$, as well as a discussion of the qualitative spectral features. From that, we conclude that despite the one-dimensional physics triggering the ground state in both compounds, a proper description of the normal-state electronic structure has to take into account the anisotropic frustrated interchain interactions on the underlying triangular lattice.