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arXiv 0912.0205cond-mat.supr-concond-mat.mes-hall
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钴基约瑟夫森结中自旋三重态超导电性的观察

Observation of spin-triplet superconductivity in Co-based Josephson Junctions

Trupti S. Khaire, Mazin A. Khasawneh, W. P. Pratt,, Norman O. Birge

摘要:

我们在含有Co(一种强铁磁材料)的约瑟夫森结中,测量了在Co和两个超导Nb电极之间插入PdNi或CuNi弱铁磁合金薄层时的长程超电流。在这样的结的临界电流几乎不衰减的Co厚度在12-28 nm的范围内,而它衰减非常陡峭的类似的结没有合金层。长程超电流是可控的合金层的厚度,达到最大的厚度为几纳米。这些实验观察提供了强有力的证据,诱导自旋三重态对的相关性,这已被预测发生在超导/铁磁混合系统中存在的某些类型的磁不均匀性。

英文摘要:

We have measured a long-range supercurrent in Josephson junctions containing Co (a strong ferromagnetic material) when we insert thin layers of either PdNi or CuNi weakly-ferromagnetic alloys between the Co and the two superconducting Nb electrodes. The critical current in such junctions hardly decays for Co thicknesses in the range of 12-28 nm, whereas it decays very steeply in similar junctions without the alloy layers. The long-range supercurrent is controllable by the thickness of the alloy layer, reaching a maximum for a thickness of a few nm. These experimental observations provide strong evidence for induced spin-triplet pair correlations, which have been predicted to occur in superconducting/ferromagnetic hybrid systems in the presence of certain types of magnetic inhomogeneity.

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。

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