Decoupling of superconducting V by ultrathin Fe layers in V/Fe multilayers.
Decoupling of superconducting V by ultrathin Fe layers in V/Fe multilayers.
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V/Fe 多层中超薄 Fe 层对超导 V 的解耦。
DOI：
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发表时间：
1994
期刊：
影响因子：
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通讯作者：
J. Aarts
中科院分区：
文献类型：
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作者：
P. Koorevaar;Y. Suzuki;R. Coehoorn;J. Aarts
本文详细研究了V/Fe多层膜的超导临界温度T和临界场H，2。系统地改变V层的厚度（dv）和Fe层的厚度（dF）以及多层中的总层数（N）。对于dF，〜 0.6nm，在恒定dv，T，以及平行（H，2 〜）和垂直（H，2 〜）取向的临界场不取决于dF或N，并且对于小的dv值，观察到H，2 〜的二维（2D）温度依赖性，而没有3D-2D交叉。没有发现T作为dF函数的振荡行为。我们的结论是，超导V层仅由0.6nm Fe完全去耦，与以前的报道一致。当在恒定dF n下减小dv时，发现Ti的强烈减小。对于所有样品，这与H、Si ~-和H ~-的温度依赖性一起可以通过现有理论来描述。
We report on a detailed study of superconducting critical temperatures T, and critical fields H, 2 of V/Fe multilayers. The thickness of the V layers (dv) and Fe layers (dF, ) as well as the total number of layers in the multilayer (N) were varied systematically. For dF, «0.6 nm, at constant dv, T, and the critical fields for parallel (H, 2~~) and perpendicular (H,») orientation do not depend on either dF, or N, and a two-dimensional (2D) temperature dependence for H, 2I~ without 3D-2D crossover is observed for small values of dv. The predicted oscillatory behavior of T, as a function of dF, is not found. %"e conclude that the superconducting V layers are completely decoupled by only 0.6 nm Fe, in con6ict with previous reports. Upon decreasing dv at constant dF„a strong decrease of T, is found. This, together with the temperature dependence of H, &~~ and H, » for all samples can be described by existing theory.