Size evolution of the oxygen interstitial nanowires in La2CuO4+y by thermal treatments and x-ray continuous illumination
Size evolution of the oxygen interstitial nanowires in La2CuO4+y by thermal treatments and x-ray continuous illumination
复制标题
La2CuO4 y 中氧间隙纳米线的热处理和 X 射线连续照射的尺寸演变
DOI：
--
复制
发表时间：
2012
期刊：
影响因子：
--
通讯作者：
A. Ricci
中科院分区：
文献类型：
--
作者：
N. Poccia;A. Bianconi;G. Campi;M. Fratini;A. Ricci
使用同步加速器 X 射线衍射作为泵浦和探针，我们展示了在最佳掺杂 La2CuO4+y 超导体中，氧间隙原子 (Oi) 在 X 射线连续照射下如何随着温度而有序化。热处理显示了 Oi 晶粒尺寸和相偏析的演变，为通过直接控制 Oi 晶粒尺寸来调节系统中的量子尺寸效应提供了新的实验途径。在这里，我们报告了氧间隙原子的排序，将样品冷却到 350 K 以下并观察纳米线的连续形成。我们展示了连续照明照射的样品中由 X 射线通量控制的有序-无序转变中的滞后现象。氧间隙晶粒生长时的形状是各向异性的，在 X 射线照射下，在 a-b 平面和 c 轴方向上显示出 Oi 有序性。
Using synchrotron x-ray diffraction as pump and probe, we show how the oxygen interstitials (Oi) become ordered as a function of temperature under x-ray continuous illumination in an optimum doped La2CuO4+y superconductor. The evolution of Oi grain size and phase segregation is shown by thermal treatments, providing a new experimental avenue for tuning quantum size effects in the system through the direct control of the size of the Oi grains. Here we report the ordering of oxygen interstitials, cooling the sample below 350 K and observing the continuous formation of nanowires. We show the hysteresis in the order–disorder transition controlled by x-ray flux in the sample irradiated with continuous illumination. The shape of oxygen interstitial grains as they grow is anisotropic, showing Oi ordering under x-ray illumination in the a–b plane and in the c-axis direction.
影响因子：
3.7
作者：
M. A. N. Ara'ujo;Antonio M. Garc'ia-Garc'ia-Antonio-M.-Garc'ia-Garc'ia-1397392420;P. Sacramento
通讯作者：
M. A. N. Ara'ujo;Antonio M. Garc'ia-Garc'ia-Antonio-M.-Garc'ia-Garc'ia-1397392420;P. Sacramento