Effects of pressure and doping on Ruddlesden-Popper phases La_(n+1)Ni_(n)O_(3 n+1)  

作　　者：Mingxin Zhang Cuiying Pei Qi Wang Yi Zhao Changhua Li Weizheng Cao Shihao Zhu Juefei Wu Yanpeng Qi 

机构地区：[1]School of Physical Science and Technology,ShanghaiTech University,Shanghai 201210,China [2]ShanghaiTech Laboratory for Topological Physics,ShanghaiTech University,Shanghai 201210,China [3]Shanghai Key Laboratory of High-resolution Electron Microscopy,ShanghaiTech University,Shanghai 201210,China

出　　处：《Journal of Materials Science & Technology》2024年第18期147-154,共8页材料科学技术（英文版）

基　　金：supported by the National Natural Science Foundation of China(Grant Nos.52272265,U1932217,11974246,12004252);the National Key R&D Program of China(Grant No.2018YFA0704300);the Shanghai Science and Technology Plan(Grant No.21DZ2260400);support from the Analytical Instrumentation Center(#SPST-AIC10112914),SPST,ShanghaiTech University.

摘　　要：Recently,the discovery of superconductivity with a critical temperature Tc up to 80 K in Ruddlesden-Popper phases La_(n+1)Ni_(n)O_(3 n+1)(n=2)under pressure has garnered considerable attention.Up to now,the superconductivity was only observed in La_(3)Ni_(2)O_(7)single crystal grown with the optical-image float-ing zone furnace under oxygen pressure.It remains to be understood the effect of chemical doping on superconducting La_(3)Ni_(2)O_(7)as well as other Ruddlesden-Popper phases.Here,we systematically investi-gate 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 prop-erties of Ruddlesden-Popper phases.We find pressure-induced superconductivity up to 86 K in La_(3)Ni_(2)O_(7)polycrystalline sample,while no signatures of superconductivity are observed in La_(2)NiO_(4)and La_(4)Ni_(3)O_(10)polycrystalline samples under high pressure up to 50 GPa.Our study sheds light on the exploration of high-Tc superconductivity in nickelates.

关 键 词：Unconventional superconductivity High pressure NICKELATES Ruddlesden-Popper phases 

分 类 号：TG174.4[金属学及工艺—金属表面处理]