Understanding irradiation damage in high-temperature superconductors for fusion reactors using high resolution X-ray absorption spectroscopy
Understanding irradiation damage in high-temperature superconductors for fusion reactors using high resolution X-ray absorption spectroscopy
复制标题
使用高分辨率 X 射线吸收光谱了解聚变反应堆高温超导体的辐照损伤
DOI：
10.1038/s43246-022-00272-0
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发表时间：
2022
影响因子：
7.8
通讯作者：
Nicholls R
中科院分区：
文献类型：
--
作者：
Nicholls R
了解快中子对高温超导体的影响变得越来越重要，因为新型紧凑型聚变反应堆依赖这些材料来产生限制等离子体所需的高磁场。已知最有希望用于小型聚变装置的候选材料稀土铜酸钡的临界温度随着辐射剂量单调降低，这表明材料中到处都会产生晶格缺陷。在这里，我们使用高能量分辨率的X射线吸收光谱来探测氧亚晶格中He+离子辐照引起的点缺陷如何影响铜原子周围的局域环境。密度泛函理论计算用于解释光谱特征，我们发现明确的证据表明离子辐照显着破坏了负责该化合物超导性的铜-氧平面中铜原子周围的键合环境。我们建议生成与我们的实验结果一致的特定弗伦克尔缺陷。我们的结果挑战了文献中先前的假设，即辐照仅在链位点产生点缺陷。此外，我们表明通过在适度温度下退火可以实现部分恢复，这可能对超导聚变磁体的运行产生影响。
Understanding the effects of fast neutrons on high-temperature superconductors is of growing importance as new compact fusion reactors rely on these materials to generate the high magnetic fields needed to confine the plasma. The critical temperature of the most promising candidate material for small-scale fusion devices, rare-earth barium cuprate, is known to decrease monotonically with radiation dose, indicating the generation of lattice defects everywhere in the material. Here, we use high-energy-resolution X-ray absorption spectroscopy to probe how the local environment around the copper atoms is influenced by point defects induced by He+ion irradiation in the oxygen sublattice. Density functional theory calculations are used to interpret spectral features and we find clear evidence that ion irradiation significantly disrupts the bonding environment around the copper atoms in the copper-oxygen planes responsible for superconductivity in this compound. We propose the generation of a specific Frenkel defect that is consistent with our experimental results. Our results challenge previous assumptions in the literature that irradiation produces point defects only in the chain sites. In addition, we show that partial recovery is possible by annealing at modest temperatures, which may have implications for the operation of superconducting fusion magnets.
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影响因子：
3.9
作者：
Cutsail, George E., III;Blaesi, Elizabeth J.;DeBeer, Serena
通讯作者：
DeBeer, Serena
辐射损伤对涂层导体超导性能影响的现场测量
影响因子：
3.6
作者：
Iliffe W
通讯作者：
Iliffe W
氧缺陷对 YBa2Cu3O6 x 输运特性和 Tc 的影响：平面和链氧的位移能以及对辐照诱导电阻率和 Tc 抑制的影响。
DOI：
--
发表时间：
1996
期刊：
Physical Review B (Condensed Matter)
影响因子：
--
作者：
S. K. Tolpygo;J.;M. Gurvitch;S. Y. Hou;Julia M. Phillips
通讯作者：
Julia M. Phillips
影响因子：
--
作者：
Nord M;Vullum PE;MacLaren I;Tybell T;Holmestad R
通讯作者：
Holmestad R
影响因子：
2.5
作者：
Diaz-Moreno S;Amboage M;Basham M;Boada R;Bricknell NE;Cibin G;Cobb TM;Filik J;Freeman A;Geraki K;Gianolio D;Hayama S;Ignatyev K;Keenan L;Mikulska I;Mosselmans JFW;Mudd JJ;Parry SA
通讯作者：
Parry SA