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arXiv 1004.4176cond-mat.supr-con
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Pb $_y$ Bi $_{1.95-y}$ Sr $_{1.49}$ La $_{0.4}$ Cu $_{1.15}$ O $_{6+δ}$ 0<y<0.53的结构行为

Structural behavior of Pb$_y$Bi$_{1.95-y}$Sr$_{1.49}$La$_{0.4}$Cu$_{1.15}$O$_{6+δ}$ for 0<y<0.53

O. Lübben, L. Dudy, A. Krapf, C. Janowitz, R. Manzke

备注：
17 pages, 4 figures
发表信息：
Phys. Rev. B 81, 174112 (2010)
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摘要：

在铋铜酸盐中，近1 $\times$ 5超结构的存在是众所周知的。通常，这种超结构被铅的取代所抑制，但也有报道称在所谓的α和β相中存在相分离。本文详细介绍了相分离的发展过程和原因，以及铅取代后准1 $\times$ 5超结构的变化。为此，用扫描隧道显微镜和低能电子衍射研究了镧和铅取代的单层超导体Bi $_{2+z}$ Sr $_{2-z}$ CuO $_{6+δ}$. La含量在稍欠掺杂浓度下保持恒定，而Pb含量系统地变化。热力学考虑表明α和β相的相混合物是不可避免的。

英文摘要：

In the Bi cuprates, the presence of a near 1$\times$5 superstructure is well known. Usually, this superstructure is suppressed by the substitution of lead, but there have been reports of a phase separation in so called α and β phases. This paper shows in high detail time how and why the phase separation develops and what happens to the quasi-1$\times$5 superstructure upon lead substitution. For this purpose, the lanthanum- and lead-substituted single-layered superconductor Bi$_{2+z}$Sr$_{2-z}$CuO$_{6+δ}$ has been investigated by scanning tunneling microscopy and low-energy electron diffraction. The La content was kept constant at slightly under-doped concentration while the Pb content was changed systematically. Thermodynamic considerations show that a phase mixture of α and β phases is inevitable.

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