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Enhanced two-component superconductivity in CoSi2/TiSi2 heterojunctions

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arxiv 2202.08989 v1 pith:4JJRGQ2N submitted 2022-02-18 cond-mat.supr-con

Enhanced two-component superconductivity in CoSi2/TiSi2 heterojunctions

Shao-Pin Chiu , Vivek Mishra , Yu Li , Fu-Chun Zhang , Stefan Kirchner , Juhn-Jong Lin This is my paper
classification cond-mat.supr-con
keywords cosi2tisi2enhancedfoundheterojunctionspronouncedsuperconductingsuperconductivity
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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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