J. Mater. Sci. Technol. ›› 2024, Vol. 185: 147-154.DOI: 10.1016/j.jmst.2023.11.011

• Research article • Previous Articles     Next Articles

Effects of pressure and doping on Ruddlesden-Popper phases Lan+1 Nin O3n+1

Mingxin Zhanga, Cuiying Peia, Qi Wanga,b, Yi Zhaoa, Changhua Lia, Weizheng Caoa, Shihao Zhua, Juefei Wua, Yanpeng Qia,b,c,*   

  1. aSchool of Physical Science and Technology, ShanghaiTech University, Shanghai 201210, China;
    bShanghaiTech Laboratory for Topological Physics, ShanghaiTech University, Shanghai 201210, China;
    cShanghai Key Laboratory of High-resolution Electron Microscopy, ShanghaiTech University, Shanghai 201210, China
  • Received:2023-09-14 Revised:2023-11-01 Accepted:2023-11-15 Online:2023-12-15
  • Contact: *School of Physical Science and Technology, Shang- haiTech University, Shanghai 201210, China. E-mail address: qiyp@shanghaitech.edu.cn (Y. Qi).

Abstract: Recently, the discovery of superconductivity with a critical temperature Tc up to 80 K in Ruddlesden-Popper phases Lan+1NinO3n+1 (n = 2) under pressure has garnered considerable attention. Up to now, the superconductivity was only observed in La3Ni2O7 single crystal grown with the optical-image floating zone furnace under oxygen pressure. It remains to be understood the effect of chemical doping on superconducting La3Ni2O7 as well as other Ruddlesden-Popper phases. Here, we systematically investigate the effect of external pressure and chemical doping on polycrystalline Ruddlesden-Popper phases. Our results demonstrate that the application of pressure and doping effectively tunes the transport properties of Ruddlesden-Popper phases. We find pressure-induced superconductivity up to 86 K in La3Ni2O7 polycrystalline sample, while no signatures of superconductivity are observed in La2NiO4 and La4Ni3O10 polycrystalline samples under high pressure up to 50 GPa. Our study sheds light on the exploration of high-Tc superconductivity in nickelates.

Key words: Unconventional superconductivity, High pressure, Nickelates, Ruddlesden-Popper phases