https://arxiv.org/abs/2308.06589

On the Experimental Evidence for Possible Superconductivity in LK99The desire to create an energy efficient world is bound to be incompletewithout the discovery of a room temperature superconductor at ambient pressure.A recent report on the room-temperature ambient-pressure superconductor hasinspired scientists to study the Cu doped Lead apatite named as LK-99. Here, wehave synthesized Cu doped LK-99 and Ni-doped LK-99 compounds and studied theirtemperature dependent transport and magnetization behavior. In spite of thepresence of impurity phase Cu$_2$S, the temperature dependent resistance showsan insulating nature of the sample. The radio frequency penetration depthmeasurement unveils the absence of diamagnetic flux expulsion in this sample.The temperature dependent ac susceptibility measurements reveal theparamagnetic nature of the Ni doped LK-99.arxiv.org

인도 어디서 구워봤는데 부도체특성 밖에 안나왔다고함 ㅇ