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arXiv 1111.5809cond-mat.supr-con
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多层接触结构下铁磁CrO $_2$中的长程自旋超电流

Long range spin supercurrents in ferromagnetic CrO$_2$ using a multilayer contact structure

M. S. Anwar, M. Veldhorst, A. Brinkman, J. Aarts

摘要:

报道了在TiO $_2$衬底上沉积的铁磁和自旋极化CrO $_2$的长程超电流测量结果。在早期的工作中,我们发现在蓝宝石上生长的薄膜中存在超导电流,但在TiO $_2$上没有。在这里,我们采用了一种特殊的接触安排,由Ni/Cu三明治之间的薄膜和超导非晶Mo $_{70}$ Ge $_{30}$电极。触点之间的距离几乎是一微米,我们发现临界电流密度要显着高于发现在蓝宝石上沉积的薄膜。我们认为,这是由于自旋混合的Ni/Cu/CrO $_2$层结构,这是有助于产生的奇频自旋三重态相关进行超导。

英文摘要:

e report measurements of long ranged supercurrents through ferromagnetic and fully spin-polarized CrO$_2$ deposited on TiO$_2$ substrates. In earlier work, we found supercurrents in films grown on sapphire but not on TiO$_2$. Here we employed a special contact arrangement, consisting of a Ni/Cu sandwich between the film and the superconducting amorphous Mo$_{70}$Ge$_{30}$ electrodes. The distance between the contacts was almost a micrometer, and we find the critical current density to be significantly higher than found in the films deposited on sapphire. We argue this is due to spin mixing in the Ni/Cu/CrO$_2$ layer structure, which is helpful in the generation of the odd-frequency spin triplet correlations needed to carry the supercurrent.

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