Speaker
Description
The recent discovery of high-temperature superconductivity at 80 K in La3Ni2O7 under high pressure has established nickelates as a new family of high-Tc superconductors, alongside the cuprates and iron-based systems[1-4]. This breakthrough has since been extended to other Ruddlesden-Popper nickelates under pressure and in thin-film form at ambient pressure. Our research group, working in collaboration with researchers worldwide, has been at the forefront of investigating the fundamental properties of these materials. Our studies, spanning both ambient and high-pressure conditions, have revealed a complex landscape featuring density-wave-like orders[4], structural transitions[5,6], strange metal behavior[1], and orbital-dependent electronic correlations[7,8]. Furthermore, we have explored the critical roles of oxygen vacancies[9], magnetic excitations[10], and doping in shaping the phase diagram. In this talk, I will review these key experimental discoveries and discuss the essential parameters that govern the emergence of high-Tc superconductivity in Ruddlenden-Popper nickelates, providing crucial insights into the mechanism of unconventional superconductivity.
References:
[1] H. L. Sun, M. W. Huo et al., Nature 621, 493(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] J. Y. Li, D. Peng, P. Y. Ma et al., National Science Review, nwaf220 (2025)
[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] Z. H. Dong, M. W. Huo, J. Li et al., Nature 630, 847 (2024)
[10] T. Xie, M. W. Huo, X. S. Ni et al., Sci. Bull. 69, 3221(2024)