Since the discovery of superconductivity at 80 K in single crystals of La₃Ni₂O₇ at pressures above 14.0 GPa, extensive efforts have been made to understand the properties of the bilayer nickelate system at both ambient and high pressure [1-3]. Density-wave-like orders, structural transition, strange metal behavior, oxygen vacancies, and orbital-dependent correlations were observed in the pressure-dependent phase diagram of La₃Ni₂O₇[4-9]. However, their connections to the high-T_c superconductivity are still under debate. In this talk, I will briefly introduce the discovery of superconductivity in La₃Ni₂O₇ and discuss recent experimental research progress.

Reference:

[1] H. L. Sun, M. W. Huo, X. W. Hu et al., Nature 621, 493-498(2023)              

[2] Y. N. Zhang, D. J. Su, Y. E. Huang et al., Nature Physics, 20, 1269(2024) 

[3] J. Hou, P. T. Yang, Z. Y. Liu et al., Chinese Physics Letters 40, 117302(2023)

[4] Z. Liu, H. L. Sun, M. W. Huo, et al., Sci. China-Phys. Mech. Astron. 66, 217411(2023).

[5] L. H. Wang, Y. Li, S. Y. Xie et al., JACS 146, 7506(2024)

[6] Z. H. Dong, M. W. Huo, J. Li et al., Nature 630, 847 (2024)

[7] J. Yang, L. Zhao, M. Wang, X. J. Zhou et al., Nat. Commnu. 15, 4373(2024)

[8] Z. Liu, M. W. Huo, J. Li et al., Nat. Commnu. 15, 7570(2024)

[9] T. Xie, M. W. Huo, X. S. Ni et al., Sci. Bull. 2024, In Press, https://doi.org/10.1016/j.scib.2024.07.030