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arXiv 1107.2252cond-mat.supr-con
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铁磁-超导体Co/CoO/In结界面上三重态节序参量和单重态序参量的共存

Coexistence of a triplet nodal order-parameter and a singlet order-parameter at the interfaces of ferromagnet-superconductor Co/CoO/In junctions

Shay Hacohen-Gourgy, Boaz Almog, Guy Deutscher

摘要:

我们提出了微分电导测量钴/钴氧化物/铟平面结,500 nm × 500 nm的大小。结跨越很宽的势垒范围,从非常低的势垒到隧道势垒。所有结的特征电导在低偏压下均呈现V型结构,而不是S波序参量的U型特征。对于所有的结,电导峰的偏置都大于铟的带隙。这两种性质都排除了纯粹的s波配对。该数据很好地拟合的模型,假设S波单重态和等自旋P波三重态流体的共存。我们发现,s-波和p-波间隙的值遵循BCS温度依赖性和s-波流体的振幅增加的势垒强度。

英文摘要:

We present differential conductance measurements of Cobalt / Cobalt-Oxide / Indium planar junctions, 500nm x 500nm in size. The junctions span a wide range of barriers, from very low to a tunnel barrier. The characteristic conductance of all the junctions show a V-shape structure at low bias instead of the U-shape characteristic of a s-wave order parameter. The bias of the conductance peaks is, for all junctions, larger than the gap of indium. Both properties exclude pure s-wave pairing. The data is well fitted by a model that assumes the coexistence of s-wave singlet and equal spin p-wave triplet fluids. We find that the values of the s-wave and p-wave gaps follow the BCS temperature dependance and that the amplitude of the s-wave fluid increases with the barrier strength.

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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