高$T_c$ Sr/O共掺La $_{2-x}$ Sr $_x$ CuO $_{4+y}$的分级超结构
Staging superstructures in high-$T_c$ Sr/O co-doped La$_{2-x}$Sr$_x$CuO$_{4+y}$
摘要：
我们提出了一个最佳的高$T_c$超导体La $_{2-x}$ Sr $_x$ CuO $_{4+y}$的结构相的高能X射线衍射研究的共同空穴掺杂定制。具体来说，这是通过分别改变两种非常不同的化学物质Sr和O的含量来完成的，以研究每种化学物质的影响。在所有样品中观察到称为分级的超结构，对于较高的Sr掺杂$x$，分级数$n$增加。我们发现，阶段阶段出现突然与温度，并可以被描述为一个二级相变与过渡温度略有依赖于Sr掺杂。Sr似乎与间隙氧以一种方式相关联，该方式稳定了在特定样品中的分级期和体积分数方面的分级相的再现性。在这封信中研究的结构细节似乎没有直接关系的电子相分离先前观察到的相同的样品。这提供了新的证据表明，电子相分离是由整体的空穴浓度，而不是特定的Sr/O含量和concommittant结构的细节。
英文摘要：
We present high energy X-ray diffraction studies on the structural phases of an optimal high-$T_c$ superconductor La$_{2-x}$Sr$_x$CuO$_{4+y}$ tailored by co-hole-doping. This is specifically done by varying the content of two very different chemical species, Sr and O, respectively, in order to study the influence of each. A superstructure known as staging is observed in all samples, with the staging number $n$ increasing for higher Sr dopings $x$. We find that the staging phases emerge abruptly with temperature, and can be described as a second order phase transition with transition temperatures slightly depending on the Sr doping. The Sr appears to correlate the interstitial oxygen in a way that stabilises the reproducibility of the staging phase both in terms of staging period and volume fraction in a specific sample. The structural details as investigated in this letter appear to have no direct bearing on the electronic phase separation previously observed in the same samples. This provides new evidence that the electronic phase separation is determined by the overall hole concentration rather than specific Sr/O content and concommittant structural details.
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