Frustrated superconductivity and intrinsic reduction of Tc in trilayer nickelate

Qiong Qin; Jiangfan Wang; Yi-feng Yang

doi:10.59717/j.xinn-mater.2024.100102

The Innovation Materials > 2024 Vol. 2 > No. 4 > 100102

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Frustrated superconductivity and intrinsic reduction of T_c in trilayer nickelate

1.
Beijing National Laboratory for Condensed Matter Physics and Institute of Physics, Chinese Academy of Sciences, Beijing 100190, China
2.
University of Chinese Academy of Sciences, Beijing 100049, China
3.
School of Physics, Hangzhou Normal University, Hangzhou 311121, China
4.
Songshan Lake Materials Laboratory, Dongguan 523808, China
5.
These authors contributed equally to this work

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Corresponding author: yifeng@iphy.ac.cn
Received Date: July 07, 2024

Accepted Date: October 29, 2024

Published Online: November 07, 2024

The Innovation Materials 2(4), https://doi.org/10.59717/j.xinn-mater.2024.100102 | Cite this article

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PUBLIC SUMMARY

PUBLIC SUMMARY
1. The trilayer nickelate exhibits frustrated superconductivity with competing interlayer pairings.
  
  The superconductivity has a complex doublet order parameter like the Higgs field in particle physics.
  
  The frustration reduces its superconducting T_c by over half compared to that of bilayer nickelates.
  
  The interlayer pairing causes a Josephson frequency half that of usual intralayer pairing superconductors.

ABSTRACT

ABSTRACT

Identifying the key factors controlling the magnitude of T_c is of critical importance in the pursuit of high-temperature superconductivity. In cuprates, T_c reaches its maximal value in trilayer structure, leading to the belief that interlayer coupling may help promote the pairing. In contrast, for the recently discovered nickelate superconductors under high pressure, the maximum T_c is reduced from about 80 K in the bilayer La₃Ni₂O₇ to 30 K in the trilayer La₄Ni₃O₁₀. Motivated by this opposite trend, we propose an interlayer pairing scenario for the superconductivity of La₄Ni₃O₁₀. Our theory reveals intrinsic frustration in the spin-singlet pairing that the inner layer tends to form with both of the two outer layers respectively, leading to strong superconducting fluctuations between layers. This explains the reduction of its maximum T_c compared to that of the bilayer La₃Ni₂O₇. Our findings support a fundamental distinction between multilayer nickelate and cuprate superconductors, and ascribe it to their different (interlayer versus intralayer) pairing mechanisms. Furthermore, our theory predicts extended s^±-wave gap structures in La₄Ni₃O₁₀, with varying signs and possible nodes on different Fermi pockets. We also find an intrinsic Josephson coupling with potentially interesting consequences that may be examined in future experiments. Our work reveals the possibility of rich novel physics in multilayer superconductors with interlayer pairing.

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Qin Q., Wang J., and Yang Y (2024). Frustrated superconductivity and intrinsic reduction of Tc in trilayer nickelate. The Innovation Materials 2(4): 100102. https://doi.org/10.59717/j.xinn-mater.2024.100102

Qin Q., Wang J., and Yang Y (2024). Frustrated superconductivity and intrinsic reduction of T_c in trilayer nickelate. The Innovation Materials 2(4): 100102. https://doi.org/10.59717/j.xinn-mater.2024.100102

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