Critical spin nature of the Cooper pairing of Nickelate superconductors: resembling cuprates, Moiré magic-angle graphene, and heavy-fermion UTe<sub>2</sub>?

ORAL

Abstract

One of the ideal routes to unravel the high-Tc pairing mechanism in cuprates is through a ‘twin sister’ – a cuprate analogue, which mimics the electronic and structural templates. Standing beside copper in the periodic table, Ni1+ in the infinite-layer phase hosts a 3d9 electronic structure - resembles the Cu2+ state in cuprates. Following the two decades debates, the recent experimental data suggests both significant similarities and distinctions to the high-Tc cuprates [1-5]. Surprisingly, some of these distinctions marked a close resemblance to the magic-angle Moiré multilayer graphene and heavy-fermion spin-triplet superconductor UTe2. Particularly, we revealed a large Pauli-limit violation in all crystallographic directions, which suggests that nickelates may host both spin-singlet and spin-triplet pairing mechanisms. In this presentation, we will share our recent angular-dependent magnetotransport and spectroscopy data, and discuss the hidden connections between nickelate superconductor and the strongly-correlated cuprates, Moiré multilayer graphene, and spin-triplet UTe2.



[1] A. S. Botana et. al., J. Exp. Theor. Phys. 132 (2021)

[2] L. E. Chow et. al., arXiv:2201.10038

[3] S. P. Harvey et. al., arXiv:2201.12971

[4] J. Fowlie et. al., Nat. Phys. 18 (2022)

[5] L. E. Chow et. al., arXiv:2204.12606

*This research is supported by the Ministry of Education (MOE), Singapore, under its Tier-2 Academic Research Fund (AcRF), Grant No. MOET2EP50121-0018, and Research Grants Council of the Hong Kong SAR, Grant No. A-CUHK 402/19. We acknowledge the support of LNCMI-CNRS, a member of the European Magnetic Field Laboratory (EMFL) under the proposal numbers TMS10-219 and TMS10-221 and the funding support from the European Union’s Horizon 2020 research and innovation programme under grant agreement No 823717 - ESTEEM3.

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Publication: Zeng, S. et al. Phys. Rev. Lett. 125, 147003 (2020).
Zeng, S. et al. Sci. Adv. 8, eabl9927 (2022).
Chow, L. E. et al. Preprint at https://arxiv.org/abs/2201.10038 (2022).
Chow, L. E. et al. Preprint at https://arxiv.org/abs/2204.12606 (2022).

Presenters

  • Lin Er Chow

    • Natl Univ of Singapore

Authors

  • Lin Er Chow

    • Natl Univ of Singapore

  • Shengwei Zeng

    • National University of Singapore

  • Saurav Prakash

    • National University of Singapore

  • Zhaoyang Luo

    • National University of Singapore

  • King Yau Yip

    • Chinese University of Hong Kong
    • The Chinese University of Hong Kong

  • mathieu pierre

    • LNCMI, Université de Toulouse, CNRS, INSA, UPS, EMFL

  • Zhaoting Zhang

    • NUS Department of Physics

  • Tobias Heil

    • Max Planck Institute for Solid State Research

  • Julia Deuschle

    • Max Planck Institute for Solid State Research

  • Proloy Nandi

    • National University of Singapore

  • Sujith Kunniniyil Sudheesh

    • National University of Singapore

  • Zhi Shiuh Lim

    • Natl Univ of Singapore

  • M. Nardone

    • LNCMI

  • Abdelaziz Zitouni

    • LNCMI, Université de Toulouse, CNRS, INSA, UPS, EMFL

  • Peter A van Aken

    • Max Planck Institute for Solid State Research

  • Elbert Chia

    • Nanyang Technological University

  • michel goiran

    • LNCMI, Université de Toulouse, CNRS, INSA, UPS, EMFL

  • Swee Kuan K Goh

    • Chinese University of Hong Kong
    • The Chinese University of Hong Kong

  • walter Escoffier

    • LNCMI, Université de Toulouse, CNRS, INSA, UPS, EMFL

  • Ariando Ariando

    • Natl Univ of Singapore