Preparation of Fine Single Crystals of Rutheno-Cuprates by the Self-Flux Method with Alumina Boats
Preparation of Fine Single Crystals of Rutheno-Cuprates by the Self-Flux Method with Alumina Boats
复制标题
氧化铝舟自熔法制备细化钌铜酸盐单晶
DOI：
10.1007/s10948-018-4803-8
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发表时间：
2019
影响因子：
1.8
通讯作者：
Irie A.
中科院分区：
文献类型：
--
作者：
Yamaki K.;Bamba Y.;Irie A.
我们研究了已知的磁性超导体钌铜酸盐的单晶生长。我们尝试了用氧化铝船的自通量法生长RuSr2GdCu2O8−δ(RuGd-1212)和RuSr2(Gd,Ce)2Cu2O10−δ(RuGd-1222)两个体系的单晶。在1350到940°C间缓慢冷却，得到了边长约为5μm的细小立方晶体。在前驱体球团表面获得了具有光滑平面的片状RuGd-1222晶体。RuGd-1222在高温下比RuGd-1212更稳定，也具有超导性，但随着冷却速率的降低，其超导性减弱。这种衰弱是由分解引起的。因此，很难获得高质量的RuGd-1222单晶，我们只能提取光滑的平面晶体部分。作为一种改进的合成技术，我们将含有Ru-Sr-Gd-Ce助熔剂的前体与RuGd-1222粉末混合，并从1350°C逐渐冷却到1090°C。从前驱体球团的侧面得到了表面光滑、尺寸为70 × 30μm2的片状ruud -1222样品。通过这种技术，我们可以分离出平面晶体部分。半定量成分分析证实该平面晶体为ruud -1222相。x射线衍射峰呈（0014）平面，表明析出的片状析出物是面向矩形轴的RuGd-1222单晶。
We investigate the single crystal growth of rutheno-cuprates, which are known to be magnetic superconductors. We attempted the single crystal growth of two systems, RuSr2GdCu2O8−δ(RuGd-1212) and RuSr2(Gd,Ce)2Cu2O10−δ(RuGd-1222), by the self-flux method with alumina boats. Fine cubic crystals of RuGd-1212 with a side length of approximately 5μm were obtained by slow cooling from 1350 to 940∘C. Plate-like RuGd-1222 crystals with a smooth plane were obtained at the surface of the precursor pellet. RuGd-1222 was more stable at high temperatures than RuGd-1212 and was also superconductive, but its superconductivity weakened as the cooling rate decreased. This weakening was induced by decomposition. Therefore, high-quality RuGd-1222 single crystals were difficult to obtain, and we failed to extract only the smooth planar crystal part. As a modified synthesis technique, we mixed a precursor containing Ru–Sr–Gd–Ce flux with RuGd-1222 powders and gradually cooled the mixture from 1350 to 1090∘C. A plate-like RuGd-1222 sample with a smooth surface and a size of 70 × 30μm2was obtained from the side surface of the precursor pellet. By this technique, we could separate the planar crystal part. Semiquantitative composition analysis confirmed this planar crystal as a RuGd-1222 phase. The X-ray diffraction peak suggested the (0014) plane, implying that the plate-like precipitates arec-axis-oriented RuGd-1222 single crystals.
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DOI：
--
发表时间：
2005
期刊：
PHYSICA B 359
影响因子：
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DOI：
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发表时间：
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期刊：
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DOI：
10.1142/s0217979203016492
发表时间：
2003
期刊：
影响因子：
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作者：
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