https://arxiv.org/abs/2308.07800

 

Phases and magnetism at microscale in compounds containing nominal Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$OAchieving superconductivity at room temperature can lead to substantially advancements in industry and technology. Recently, a compound known as Cu-doped lead-apatite Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O ($0.9 < x < 1.1$), referred to as LK-99, has been reported to exhibit unusual electrical and magnetic behaviors that appear to resemble a "superconducting transition" above room temperature. We collected compound samples containing the nominal Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O phase, which were synthesized by three independent groups, and studied their chemical, magnetic, and electrical properties at the microscale to overcome difficulties in bulk measurements. Through the utilization of optical, scanning electron, atomic force, and scanning diamond nitrogen-vacancy microscopy techniques, we are able to establish a link between local magnetic properties and specific microscale chemical phases. Our findings indicate that while the Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O phase seems to have a mixed magnetism contribution, a significant fraction of the diamagnetic response can be attributed to Cu-rich regions (e.g., Cu$_2$S from chemical reaction). Additionally, our micro-region electrical measurements reveal a phenomenon of current path jumping and a change in resistance states of Cu$_2$S. This provides a potential explanation for the electrical behavior observed in compounds related to Pb$_{10-x}$Cu$_x$(PO$_4$)$_6$O.arxiv.org



8월 15일 업데이트



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대충 우리 존나 많이 구웠다는 소리






내용 요약



우리가 존나 구워보고 샘플 측정해봤는데 370~380K 사이에서 구조적 전이가 일어나더라


특허무새가 외친대로 전기도 흘려봤는데 100초(50mA 수준으로) 흘려보니까 상전이가 일어나긴 하더라!


근데 40mA 수준으로 10초 흘리니까 상전이 없더라!


응 그거 CU2S 특성 맞으니까 아닥해



LK-99가 초전도체 특성 닮긴 했더라


근데 그거 Cu2S 특성임ㅋ


양자물질 연구하는거 재밌긴했는데 니네 착각한거 맞음 ㅅㄱ


끝.









참고로 이 논문 저자가 15명임


아까 산둥대학교가 CU2S 까는 논문 올렸는데 주류학파랑 비주류학파랑 중국내에서 존나게 싸우는듯


적어도 중국은 LK-99가 중요한게 아니라 학계 자존심이 걸린 문제까지 가서 떡밥 몇 개월은 더 갈듯