Artificial pinning center Nb-Ti superconductors with alloyed Nb pins
Artificial pinning center Nb-Ti superconductors with alloyed Nb pins
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带合金铌销钉的人工钉扎中心铌钛超导体
DOI：
10.1109/77.620693
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发表时间：
1997
影响因子：
1.8
通讯作者：
D. Larbalestier
中科院分区：
文献类型：
--
作者：
R. Heussner;C. B. Nunes;L. Cooley;D. Larbalestier
磁相互作用被认为是传统和人工钉扎中心 (APC) Nb-Ti 中主要的磁通-缺陷相互作用，强调钉扎中心的邻近长度 (/spl xi//sub N/) 作为优化高场临界电流密度的重要参数。我们对 APC 复合材料进行了表征，其中含有 25 vol.% 的 Nb pin，并与 7.5 wt.% Ta 和 10 wt.% W 合金化，以特意测试该模型的预测。我们发现，Nb10W-pin 复合材料 (/spl xi//sub N/(Nb10W)/spl sim/32 nm) 的体通量钉扎力表现出磁场 (H) 和引脚尺寸 (d/sub p/) 依赖性，与现有的纯 Nb-pin APC 复合材料相比，与传统加工的 Nb47Ti (/spl xi//sub N/(/spl alpha/-Ti)<32 nn) 更一致(/spl xi//sub N/(Nb)/spl sim/83 nm)。 Nb7Ta-pin 复合材料 (/spl xi//sub N//spl sim/59 nm) 具有中间 F/sub p/(H,d/sub p/) 行为，因此定性地支持该模型。
A magnetic interaction has been proposed as the dominant fluxon-defect interaction in conventional and artificial pinning center (APC) Nb-Ti, emphasizing the proximity length (/spl xi//sub N/) of the pinning center as the important parameter for optimizing the high field critical current density. We have characterized APC composites containing 25 vol.% of Nb pins alloyed with 7.5 wt.% Ta and 10 wt.% W to deliberately test the predictions of this model. We found that the bulk flux pinning force of the Nb10W-pin composite (/spl xi//sub N/(Nb10W)/spl sim/32 nm) exhibited a magnetic field (H) and pin size (d/sub p/) dependency that is more consistent with conventionally processed Nb47Ti (/spl xi//sub N/(/spl alpha/-Ti)<32 nn) than with existing pure Nb-pin APC composites (/spl xi//sub N/(Nb)/spl sim/83 nm). The Nb7Ta-pin composite (/spl xi//sub N//spl sim/59 nm) had intermediate F/sub p/(H,d/sub p/) behavior, thus qualitatively supporting the model.