arXivDaily arXiv每日学术速递 周一至周五更新
arXiv周末暂无论文更新,休息一下吧,周末愉快~~
arXiv 1206.2045cond-mat.supr-con
收藏

超导-铁磁异质结中三重态自旋阀效应的观测

Observation of the Triplet Spin-Valve Effect in a Superconductor-Ferromagnet Heterostructure

V. Zdravkov, J. Kehrle, G. Obermeier, D. Lenk, H. -A. Krug von Nidda, C. Müller, A. S. Sidorenko, S. Horn, R. Tidecks, L. R. Tagirov

摘要:

具有两个铁磁层的超导体-铁磁体(S-F)异质结构的理论预测了在F层的磁化的非共线对准(NCA)处产生长范围的、频率奇的三重态配对。在Nb/Cu 41 Ni 59/nc-Nb/Co/CoOx自旋阀型邻近效应异质结构中已经检测到这种三重态配对,其中F层之间的非常薄的Nb膜用作正常导电(nc)间隔物。作为外部磁场的函数的样品的电阻表明,对于不太高的字段的系统是超导在共线对齐的Cu 41 Ni 59和Co层磁矩,但切换到正常的导电状态在NCA配置。这表明NCA的超导转变温度Tc低于固定的测量温度。在NCA制度下,F层磁矩平行或反平行排列的最小Tc的存在与理论预测的单线态超导抑制的长程三重态配对产生是一致的。

英文摘要:

The theory of superconductor-ferromagnet (S-F) heterostructures with two ferromagnetic layers predicts the generation of a long-range, odd-in-frequency triplet pairing at non-collinear alignment (NCA) of the magnetizations of the F-layers. This triplet pairing has been detected in a Nb/Cu41Ni59/nc-Nb/Co/CoOx spin-valve type proximity effect heterostructure, in which a very thin Nb film between the F-layers serves as a normal conducting (nc) spacer. The resistance of the sample as a function of an external magnetic field shows that for not too high fields the system is superconducting at a collinear alignment of the Cu41Ni59 and Co layer magnetic moments, but switches to the normal conducting state at a NCA configuration. This indicates that the superconducting transition temperature Tc for NCA is lower than the fixed measuring temperature. The existence of a minimum Tc, at the NCA regime below that one for parallel or antiparallel alignments of the F-layer magnetic moments, is consistent with the theoretical prediction of a singlet superconductivity suppression by the long-range triplet pairing generation.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

↑