Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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Synthesis and physical properties of Pb10-xCux(PO4)6O: A weak diamagnetic material

  • Yoonseok Han (Department of Physics, Sungkyunkwan University) ;
  • Taehee Lee (Department of Physics, Sungkyunkwan University) ;
  • Junwon Rhie (Department of Physics, Sungkyunkwan University) ;
  • Jaegu Song (Department of Physics, Sungkyunkwan University) ;
  • Seung-Yeop Paek (Department of Physics, Sungkyunkwan University) ;
  • Seokmin Choi (Institute of Basic Science, Sungkyunkwan University) ;
  • Yongmin Kim (Department of Physics, Dankook University) ;
  • Sungmin Park (Department of Physics, Sungkyunkwan University) ;
  • Hanoh Lee (Department of Physics, Sungkyunkwan University) ;
  • Tuson Park (Department of Physics, Sungkyunkwan University)
  • Received : 2024.04.01
  • Accepted : 2024.06.14
  • Published : 2024.06.30
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Abstract

Recently, Lee et al. claimed that LK-99 isthe first room-temperature superconductor at ambient pressure, which quickly captured the attention of both the scientific community and the general public. We tried to replicate Pb10-xCux(PO4)6O, called as LK-99, and characterized its physical properties by measuring the electrical resistance and Meissner effect. The electrical resistance results for different batches exhibited structural phase transitions at different temperatures, and the magnetic measurements indicated weak diamagnetism at 300 K, which is weaker than that of water. Taken together with the structural analysis, these results suggest that the resistivity transitions are incurred by Cu-S compound generated as a byproduct during the synthesis of LK-99 and LK-99 is not a room-temperature superconductor.

Keywords

Acknowledgement

This work was supported by the National Research Foundation (NRF) of Korea through grants funded by the Korean Ministry of Science and ICT (grant numbers 2021R1A2C1014319, 2021R1A2C2010925, 2021R1I1A1A01047499, and RS-2023-00220471) and by Basic Science Research Program through the National Research Foundation of Korea (NRF) funded by the Ministry of Education (RS-2023-00248099).

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