Evidence for zero- and pi-phase order parameters of superconducting Nb/Co tri- and pentalayers from the oscillatory behavior of the transition temperature.
Evidence for zero- and pi-phase order parameters of superconducting Nb/Co tri- and pentalayers from the oscillatory behavior of the transition temperature.
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来自转变温度振荡行为的超导 Nb/Co 三层和五层的零相和 pi 相序参数的证据。
DOI：
10.1103/physrevlett.94.057008
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发表时间：
2005
影响因子：
8.6
通讯作者：
H. Fujishiro
中科院分区：
文献类型：
--
作者：
Y. Obi;M. Ikebe;H. Fujishiro
本文研究了Nb/Co超导体(S)/铁磁(F)三层系(F/S/F)和五层系(F/S/F/S/F)的超导转变温度T_c与铁磁Co层厚度的关系。五层膜系的Tc在DCO=2.0-3.2 nm之间出现局部极大值，而三层膜的Tc表现为局部极小值。TC-DCO曲线的这种差异为五层膜中存在pi相提供了明确的证据，Buzdin等人、Radovic等人和Tagirov从理论上预测了这一点。
The oscillation behavior of the superconducting transition temperature Tc as a function of the ferromagnetic Co layer thickness (dCo) has been examined for Nb/Co superconductor(S)/ferromagnetic(F) trilayer series (F/S/F) and pentalayer series (F/S/F/S/F). Tc of the pentalayer series takes a local maximum between dCo=2.0-3.2 nm, where Tc of the trilayer shows a local minimum. This difference in the Tc versus dCo curves provides a clear evidence for the occurrence of the pi phase in the pentalayers, which has been theoretically predicted by Buzdin et al., Radovic et al., and Tagirov.