arXiv 0902.26642009-02-16cond-mat.supr-con

La $_{\rm 2-x}$ Sr $_{\rm x}$ CuO $_{\rm 4}$化合物的晶格效应

Lattice effects in the La$_{\rm 2-x}$Sr$_{\rm x}$CuO$_{\rm 4}$ compounds

E. Liarokapis, E. Siranidi, D. Lampakis, K. Conder, C. Panagopoulos

备注：: 6 pages, 6 figures
发表信息：: J. Phys.: Condens. Matter 20 (2008) 434233
DOI：: 10.1088/0953-8984/20/43/434233

摘要：

几种铜酸盐的系统拉曼光谱研究（YBa $_{\rm 2}$ Cu $_{\rm 3}$ O $_{\rm x}$、YBa $_{\rm 2}$ Cu $_{\rm 4}$ O $_{\rm 8}$或Bi $_{\rm 2}$ Sr $_{\rm 2}$ CaCu $_{\rm 2}$ O $_{\rm 8}$）已经表明，在最佳掺杂下，化合物处于晶格不稳定性的边缘;一旦通过掺杂或施加外部流体静压超过该水平，转变温度的变化伴随着光谱改变。有强烈的迹象表明，T $_{\rm c}$的减少与分离成纳米级相，其中涉及CuO $_{\rm 2}$平面的氧原子。在这项工作中，修改与掺杂的La $_{\rm 2-x}$ Sr $_{\rm x}$ CuO $_{\rm 4}$化合物的拉曼光谱，这表明自旋或电荷有序耦合在整个掺杂区域的晶格畸变。

英文摘要：

Systematic Raman studies on several cuprates (YBa$_{\rm 2}$Cu$_{\rm 3}$O$_{\rm x}$, YBa$_{\rm 2}$Cu$_{\rm 4}$O$_{\rm 8}$ or Bi$_{\rm 2}$Sr$_{\rm 2}$CaCu$_{\rm 2}$O$_{\rm 8}$) have shown that at optimal doping the compounds are at the edge of lattice instability; once this level is exceeded, by means of doping or applying external hydrostatic pressure, the changes in the transition temperature are accompanied by spectral modifications. There are strong indications that the reduction in T$_{\rm c}$ is correlated with a separation into nanoscale phases, which involve the oxygen atoms of the CuO$_{\rm 2}$ planes. In this work, modifications with doping in the Raman spectra of the La$_{\rm 2-x}$Sr$_{\rm x}$CuO$_{\rm 4}$ compound are presented, which show that spin or charge ordering is coupled with lattice distortions in the whole doping region.

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