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Tunable superconductivity and its origin at KTaO3 interfaces

Author

Listed:
  • Changjiang Liu

    (Materials Science Division, Argonne National Laboratory
    University at Buffalo, SUNY)

  • Xianjing Zhou

    (Center for Nanoscale Materials, Argonne National Laboratory)

  • Deshun Hong

    (Materials Science Division, Argonne National Laboratory)

  • Brandon Fisher

    (Center for Nanoscale Materials, Argonne National Laboratory)

  • Hong Zheng

    (Materials Science Division, Argonne National Laboratory)

  • John Pearson

    (Materials Science Division, Argonne National Laboratory)

  • Jidong Samuel Jiang

    (Materials Science Division, Argonne National Laboratory)

  • Dafei Jin

    (Center for Nanoscale Materials, Argonne National Laboratory)

  • Michael R. Norman

    (Materials Science Division, Argonne National Laboratory)

  • Anand Bhattacharya

    (Materials Science Division, Argonne National Laboratory)

Abstract

What causes Cooper pairs to form in unconventional superconductors is often elusive because experimental signatures that connect to a specific pairing mechanism are rare. Here, we observe distinct dependences of the superconducting transition temperature Tc on carrier density n2D for electron gases formed at KTaO3 (111), (001) and (110) interfaces. For the (111) interface, a remarkable linear dependence of Tc on n2D is observed over a range of nearly one order of magnitude. Further, our study of the dependence of superconductivity on gate electric fields reveals the role of the interface in mediating superconductivity. We find that the extreme sensitivity of superconductivity to crystallographic orientation can be explained by pairing via inter-orbital interactions induced by an inversion-breaking transverse optical phonon and quantum confinement. This mechanism is also consistent with the dependence of Tc on n2D. Our study may shed light on the pairing mechanism in other superconducting quantum paraelectrics.

Suggested Citation

  • Changjiang Liu & Xianjing Zhou & Deshun Hong & Brandon Fisher & Hong Zheng & John Pearson & Jidong Samuel Jiang & Dafei Jin & Michael R. Norman & Anand Bhattacharya, 2023. "Tunable superconductivity and its origin at KTaO3 interfaces," Nature Communications, Nature, vol. 14(1), pages 1-10, December.
    • Handle: RePEc:nat:natcom:v:14:y:2023:i:1:d:10.1038_s41467-023-36309-2
    DOI: 10.1038/s41467-023-36309-2
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    References listed on IDEAS

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    2. Jeong Min Park & Yuan Cao & Kenji Watanabe & Takashi Taniguchi & Pablo Jarillo-Herrero, 2021. "Tunable strongly coupled superconductivity in magic-angle twisted trilayer graphene," Nature, Nature, vol. 590(7845), pages 249-255, February.
    3. Yuan Cao & Valla Fatemi & Shiang Fang & Kenji Watanabe & Takashi Taniguchi & Efthimios Kaxiras & Pablo Jarillo-Herrero, 2018. "Unconventional superconductivity in magic-angle graphene superlattices," Nature, Nature, vol. 556(7699), pages 43-50, April.
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    Cited by:

    1. Guanqun Zhang & Lijie Wang & Jinghui Wang & Guoan Li & Guangyi Huang & Guang Yang & Huanyi Xue & Zhongfeng Ning & Yueshen Wu & Jin-Peng Xu & Yanru Song & Zhenghua An & Changlin Zheng & Jie Shen & Jun , 2023. "Spontaneous rotational symmetry breaking in KTaO3 heterointerface superconductors," Nature Communications, Nature, vol. 14(1), pages 1-8, December.

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