Progress in Superconductivity and Cryogenics (한국초전도ㆍ저온공학회논문지)

The Korean Society of Superconductivity and Cryogenics (한국초전도저온학회)
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A resistivity anomaly at 380 K in reproduced LK-99

  • Sangjin Kim (Center for Novel States of Complex Materials Research, Department of Physics and Astronomy, Seoul National University) ;
  • Kwang-Tak Kim (Center for Novel States of Complex Materials Research, Department of Physics and Astronomy, Seoul National University) ;
  • Jeonghun Kang (Center for Novel States of Complex Materials Research, Department of Physics and Astronomy, Seoul National University) ;
  • Dong-Hyeon Gim (Center for Novel States of Complex Materials Research, Department of Physics and Astronomy, Seoul National University) ;
  • Yoon Han Lee (Center for Novel States of Complex Materials Research, Department of Physics and Astronomy, Seoul National University) ;
  • Kee Hoon Kim (Center for Novel States of Complex Materials Research, Department of Physics and Astronomy, Seoul National University)
  • Received : 2023.12.15
  • Accepted : 2023.12.29
  • Published : 2023.12.31
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Abstract

To confirm the room-temperature superconductivity at ambient pressure as claimed in recent arXiv preprints by Lee et al., we followed the original authors' systematic solid-state synthesis recipe to reproduce Cu-doped Pb-apatite, known as LK-99. Using X-ray diffraction and Raman spectroscopy, we identified inclusion of various impurities alongside the apatite phase in our sample. While the sample exhibited an overall semiconducting behavior in electrical transport, an intriguing resistivity anomaly at 380 K was observed, possibly originating from a structural phase transition of the Cu2-δS impurity. Based on the transport and magnetization measurements, we conclude that the sample is a non-magnetic semiconductor, with absence of superconductivity.

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Acknowledgement

This work was supported by the Ministry of Science and ICT through National Research Foundation of Korea (Grants No. 2019R1A2C2090648 and No. 2022H1D3A3A01077468) and by the Ministry of Education though core facility program (Grant No. 2021R1A6C101B418).

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