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WANG Meng. Discovery of high-Tc superconductivity in a nickelate[J]. PHYSICS, 2023, 52(10): 663-671. DOI: 10.7693/wl20231001
Citation: WANG Meng. Discovery of high-Tc superconductivity in a nickelate[J]. PHYSICS, 2023, 52(10): 663-671. DOI: 10.7693/wl20231001
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Discovery of high-Tc superconductivity in a nickelate

  • Guangdong Provincial Key Laboratory of Magnetoelectric Physics and Devices, Center for Neutron Science and Technology, School of Physics, Sun Yat-Sen University, Guangzhou 510275, China

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  • Received Date: October 10, 2023
  • Available Online: October 20, 2023
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    • Abstract
  • Exploration of unconventional superconductors and elucidation of their mechanism have been important frontiers in condensed matter physics for more than 40 years. Heavy fermi superconductors, copper oxide high-Tc superconductors, and iron-based superconductors are three large families of unconventional superconductors. Cuprates are the only family that hosts high superconducting transition temperatures above the boiling point of nitrogen at ambient pressure. Nickel oxides with Ni+ are expected to show unconventional superconductivity due to the similarity of the electronic configurations of Cu2+ and Ni+. Recently, we discovered superconductivity under 14 GPa at 80 K in a bilayer nickelate La3Ni2O7 with an average valent state of Ni2.5+. In this paper, we will describe the verification of superconductivity by electronic and magnetic measurements, as well as the determination of the crystal structure of La3Ni2O7 under pressure. The obvious difference of the magnetic ground state of La3Ni2O7 from that of copper oxide and iron-based superconductors may be vital for elucidating the mechanism of unconventional superconductivity.
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