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arXiv 2202.08989cond-mat.supr-con
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CoSi2/TiSi2异质结中双组分超导电性的增强

Enhanced two-component superconductivity in CoSi2/TiSi2 heterojunctions

Shao-Pin Chiu, Vivek Mishra, Yu Li, Fu-Chun Zhang, Stefan Kirchner, Juhn-Jong Lin

摘要:

本文报道了在(CoSi_2/Si)/TiSi_2超导体/正常金属(S/N)异质结中增强的双组分超导电性。结果表明,该薄膜的超导转变温度比CoSi_2/Si外延薄膜的超导转变温度提高了约2倍,上临界场比CoSi_2/Si外延薄膜的上临界场提高了约20倍,三端S/N结的隧穿谱显示出明显的零偏置电导峰(ZBCP),表明奇频穿透,由CoSi 2/Si界面对称性还原驱动的CoSi 2/Si中的三重态主导配对,在TiSi 2中的自旋三重态和偶宇称库珀对。超导转变温度和ZBCP的增强被发现是更明显的,如果TiSi 2是更扩散。

英文摘要:

We report enhanced two-component superconductivity in (CoSi2/Si)/TiSi2 superconductor/normal-metal (S/N) heterojunctions. An enhanced superconducting transition temperature about twice that of CoSi2 and an upper critical field about 20 times bigger than that of epitaxial CoSi2/Si films were found. The tunneling spectra of three-terminal S/N junctions show pronounced zero-bias conductance peaks (ZBCPs) that signify penetration of odd-frequency, spin-triplet and even-parity Cooper pairs in TiSi2 from triplet dominant pairing in CoSi2/Si driven by symmetry reduction at the CoSi2/Si interface. Both the enhancement of the superconducting transition temperature and the ZBCPs are found to be more pronounced if TiSi2 is made more diffusive.

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