Anomalous upper critical fields of superconducting multilayers: Verification of the Takahashi-Tachiki effect.
Anomalous upper critical fields of superconducting multilayers: Verification of the Takahashi-Tachiki effect.
复制标题
超导多层膜的反常上临界场：高桥立木效应的验证。
DOI：
10.1103/physrevlett.60.1751
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发表时间：
1988
影响因子：
8.6
通讯作者：
Ø. Fischer
中科院分区：
文献类型：
--
作者：
M. Karkut;V. Matijasevic;L. Antognazza;J. Triscone;N. Missert;Malcolm Beasley;Ø. Fischer
我们观察到的第一次在平行的上临界场预测的金属多层膜，这两种材料具有不同的扩散系数，但具有相同的超导转变温度的异常上翘。我们观察到这种上升，这反映了成核场从清洁层到脏层的移动，在Nb/Nb 0.6 Ti 0.4的多层膜中，具有组分波长Λ≥ 420埃。正如理论所预测的那样，发生上升的温度随着Λ的增加而增加。
We observe for the first time the anomalous upturn in the parallel upper critical field predicted for metallic multilayers composed of two materials which have different diffusion coefficients but which have the same superconducting transition temperature. We observe this upturn, which reflects the shift of the nucleation field from the clean to the dirty layers, in multilayers of Nb/Nb 0.6 Ti 0.4 having composition wavelengths Λ≥ 420 Å. The temperature at which the upturn occurs increases with Λ, as predicted by theory.