First-order transition in LK-99 containing Cu2S

2023/08/08 by Shilin Zhu, Wei Wu, Zheng Li +1 · 1 voice · 1 citation
Earth and Planetary Sciences · Materials Science · #High-pressure geophysics and materials #Thermal Expansion and Ionic Conductivity #Crystal Structures and Properties

paper · pdf · doi:10.1016/j.matt.2023.11.001

Abstract

Lee et al. reported that the compound LK99, with a chemical formula of Pb_10-xCu_x(PO₄)₆O (0.9<x<1.1), exhibits room-temperature superconductivity under ambient pressure. In this study, we investigated the transport and magnetic properties of pure Cu₂S and LK-99 containing Cu₂S. We observed a sharp superconducting-like transition and a thermal hysteresis behavior in the resistivity and magnetic susceptibility. However, we did not observe zero-resistivity below the transition temperature. We argue that the so-called superconducting behavior in LK-99 is most likely due to a reduction in resistivity caused by the first order structural phase transition of Cu₂S at around 385 K, from the β phase at high temperature to the γ phase at low temperature.

Citations

• Ferromagnetic half levitation of LK-99-like synthetic samples

Cited by

• Report on reproducibility in condensed matter physics
• Electronic structure and vibrational stability of copper-substituted lead apatite LK-99

Discussions

• First order transition in [LK-99] containing Cu2S [hn, 57 points, 13 comments]

Related

• On the Experimental Evidence for Possible Superconductivity in LK99
• The characteristics of LK-99 by Cu₂S removal using ammonia solution: A diamagnetic semiconductor
• Replication and study of anomalies in LK-99--the alleged ambient-pressure, room-temperature superconductor
• Observation of abnormal resistance-temperature behavior along with diamagnetic transition in Pb_10-xCu_x(PO₄)₆O-based composite
• Synthesis of possible room temperature superconductor LK-99: Pb₉Cu(PO₄)₆O