具有铁磁Cu $_{2}$ MnAl-Heusler势垒的Josephson结中三重态超导电性的证据
Evidence for triplet superconductivity in Josephson junctions with ferromagnetic Cu$_{2}$MnAl-Heusler barriers
摘要：
本文研究了由Heusler化合物Cu $_2$ MnAl制备的势垒约瑟夫森结。在制备状态下，Cu $_2$ MnAl层是非铁磁性的，并且临界约瑟夫森电流密度$j_{c}$随着Heusler层$d_{F}$的厚度呈指数下降。在240 \degree C退火的结的Heusler层开发铁磁秩序，我们观察到的依赖性（$j_{c}(d_{F}$）与$j_{c}$强烈增强和弱的厚度依赖于在厚度范围7.0 nm <$d_{F}$ <10.6 nm。我们把这一特点归因于三重态成分的超导配对功能所产生的特定的磁化曲线内薄Cu $_2$ MnAl层。
英文摘要：
We have studied Josephson junctions with barriers prepared from the Heusler compound Cu$_2$MnAl. In the as-prepared state the Cu$_2$MnAl layers are non ferromagnetic and the critical Josephson current density $j_{c}$ decreases exponentially with the thickness of the Heusler layers $d_{F}$. On annealing the junctions at 240\degree C the Heusler layers develop ferromagnetic order and we observe a dependence $j_{c}(d_{F}$) with $j_{c}$ strongly enhanced and weakly thickness dependent in the thickness range 7.0 nm < $d_{F}$ < 10.6 nm. We attribute this feature to a triplet component in the superconducting pairing function generated by the specific magnetization profile inside thin Cu$_2$MnAl layers.
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