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Impurity-induced bound states as a signature of pairing symmetry in multiband superconducting CeCu2Si2

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Abstract

The notion of multiband superconductivity with dominant two-gap features has been recently applied to the unconventional superconductor CeCu2Si2 for challenging the previously accepted concept of nodal d-wave pairing. In the proposed study, the realistic multiband Fermi surface topology of CeCu2Si2 was obtained through first-principles calculations, and analysis was conducted with an effective two-band hybridization model including detailed band structure. Within the T-matrix approximation, the obtained calculation results show that different pairing candidates, including fully gapped s-wave, loop-nodal s-wave, and d-wave pairings, could yield qualitatively distinct features characterized by impurity-induced bound states. These features can be verified through high-resolution scanning tunneling microscopy or spectroscopy and provide corroborative justification that would be beneficial for the ongoing research regarding the superconducting gap symmetry of CeCu2Si2 at ambient pressure.

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Acknowledgements

This work was supported by the National Natural Science Foundation of China under Grant Nos. 11774025, 11774401, and 11522435. Y. Y. was also supported by the National Key R&D Program of China (Grant No. 2017YFA0303103) and the Strategic Priority Research Program (B) of the Chinese Academy of Sciences (Grant No. XDB07020200). S. F. was supported by the National Key R&D Program of China (Grant No. 2016YFA0300304).

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Authors and Affiliations

  1. Department of Physics, Beijing Jiaotong University, Beijing, 100044, China

    Dong-Dong Wang & Bin Liu

  2. Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing, 100190, China

    Min Liu & Yi-Feng Yang

  3. University of Chinese Academy of Sciences, Beijing, 100049, China

    Yi-Feng Yang

  4. Collaborative Innovation Center of Quantum Matter, Beijing, 100190, China

    Yi-Feng Yang

  5. Department of Physics, Beijing Normal University, Beijing, 100875, China

    Shi-Ping Feng

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  1. Dong-Dong Wang
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  2. Bin Liu
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  3. Min Liu
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  4. Yi-Feng Yang
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  5. Shi-Ping Feng
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Correspondence to Bin Liu or Yi-Feng Yang.

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Wang, DD., Liu, B., Liu, M. et al. Impurity-induced bound states as a signature of pairing symmetry in multiband superconducting CeCu2Si2. Front. Phys. 14, 13501 (2019). https://doi.org/10.1007/s11467-018-0852-5

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  • DOI: https://doi.org/10.1007/s11467-018-0852-5

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