Critical currents in proton‐irradiated single‐crystal Ba2YCu3O7−δ
Critical currents in proton‐irradiated single‐crystal Ba2YCu3O7−δ
复制标题
质子辐照单晶 Ba2YCu3O7−δ 的临界电流
DOI：
10.1063/1.103269
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发表时间：
1990
影响因子：
4
通讯作者：
J. Waszczak
中科院分区：
文献类型：
--
作者：
R. B. Dover;E. Gyorgy;A. White;L. Schneemeyer;R. J. Felder;J. Waszczak
用3.5 MeV的质子辐照会在Ba 2 YCu 3 O 7 −δ中产生缺陷，这些缺陷可以作为强钉扎位点，与中子辐照产生的缺陷相当。事实上，质子和中子都经历了导致原子位移的动量转移碰撞;额外的电子质子-固体相互作用似乎不会产生有助于钉扎的缺陷。在优化的条件下，获得了J_c（T→0，H=1 T）≥ 2×107 A/cm ~ 2的单晶。在77 K时，Jc值仍为1.7×105 A/cm ~ 2，在6 T的磁场中仅减小三倍。的注量和温度依赖性的Jc建议一个模型，在该模型中，空间不相关的缺陷钉涡核。
Irradiation with 3.5 MeV protons creates defects in Ba2YCu3O7−δ, which can act as strong pinning sites, comparable to those produced by neutron irradiation. Indeed protons as well as neutrons undergo momentum‐transferring collisions that result in atomic displacements; the additional electronic proton‐solid interaction does not appear to yield defects which contribute to pinning. Under optimized conditions we have obtained Jc(T→0, H=1 T)∼2×107 A/cm2 in single crystals. At 77 K the value is still Jc∼1.7×105 A/cm2, decreasing only threefold in a field of 6 T. The fluence and temperature dependence of Jc suggest a model, in which spatially uncorrelated defects pin vortex cores.