首页|Signature of Superconductivity in Pressurized La4Ni3O10
Signature of Superconductivity in Pressurized La4Ni3O10
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The discovery of high-temperature superconductivity near 80 K in bilayer nickelate La3Ni2O7 under high pressures has renewed the exploration of superconducting nickelate in bulk materials.The extension of supercon-ductivity in other nickelates in a broader family is also essential.Here,we report the experimental observation of superconducting signature in trilayer nickelate La4Ni3O10 under high pressures.By using a modified sol-gel method and post-annealing treatment under high oxygen pressure,we successfully obtained polycrystalline La4Ni3O10 samples with different transport behaviors at ambient pressure.Then we performed high-pressure electrical resistance measurements on these samples in a diamond-anvil-cell apparatus.Surprisingly,the signa-ture of possible superconducting transition with a maximum transition temperature(Tc)of about 20 K under high pressures is observed,as evidenced by a clear drop of resistance and the suppression of resistance drops under magnetic fields.Although the resistance drop is sample-dependent and relatively small,it appears in all of our measured samples.We argue that the observed superconducting signal is most likely to originate from the main phase of La4Ni3O10.Our findings will motivate the exploration of superconductivity in a broader family of nickelates and shed light on the understanding of the underlying mechanisms of high-Tc superconductivity in nickelates.
李庆、张英杰、项浙宁、张宇航、祝熙宇、闻海虎
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National Laboratory of Solid State Microstructures and Department of Physics,Center for Superconducting Physics and Materials,Collaborative Innovation Center of Advanced Microstructures,Nanjing University,Nanjing 210093,China
国家重点研发计划国家自然科学基金国家自然科学基金国家自然科学基金国家自然科学基金Strategic Priority Research Program(B)of Chinese Academy of Sciences
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