1

저자 소속은 미해군연구소

앞서 로렌스버클리의 그리핀 DFT 논문에 대한 코멘트.
일부 과장된 데이터가 들어가있고, 이를 피하기 위해선 다른 모델을 써야함. 그 경우 화학적으로 절연체일 것으로 생각함.

2

저자 북경사범대학교

Pb10(PO4)6O는 indirection band gap 반도체 구조로 보임.
하지만 적절한 납 위치에 구리를 도핑한다면 반금속으로 전이됨.
양극성 자성 반도체 (Bipolar magnetic semiconductors)로 보임.
이 수송 특성은 이전 둥난대 논문 결과와 일치하는 것으로 보임.

(참고용 둥난대 논문 )

Current percolation model for the special resistivity behavior observed in Cu-doped ApatiteSince the initial report of the potential occurrence of room-temperaturesuperconductivity under normal pressure [arXiv: 2307.12008], there has beensignificant interest in the field of condensed matter physics regardingCu-doped Apatite (Pb10-xCux(PO4)6O). In this study, we performedtemperature-dependent resistivity measurements on the synthesizedPb10-xCux(PO4)6O samples. The structure of the sample was confirmed to matchthe reference literature through X-ray diffraction analysis. Remarkably, weobserved four distinct types of resistivity behaviors within samples from thesame pellet: (1) A semiconductor-like behavior characterized by a decrease inresistivity as the temperature is lowered. (2) A gradual reduction inresistivity, reaching an exceptionally small value that falls below theresolution limits of our measurement equipment. (3) An abrupt drop inresistivity to a low value at ~ 250 K. (4) An almost linear reduction inresistivity exhibiting a transition at approximately 7 K (possibly associatedwith Pb). Following a thorough compositional analysis, we proposed a currentpercolation model, based on the formation of a Cu/Pb current channel, toelucidate the observed special resistivity behaviors. It is important to notethat the Meissner effect was not observed in our magnetization measurements.Consequently, we reached the conclusion that the presence of superconductivityin Cu-doped Apatite has yet to be substantiated.arxiv.org


저자 노스웨스턴대학교

시뮬레이션으로 열역학적 & 안정성을 조사해봄.
Pb10(PO4)6O랑 Pb10(PO4)6(OH)2는 열역학적 안정인데 Cu 치환한 경우는 불안정해. 하지만 Cu를 넣은 경우 산소 공극이 형성될 가능성이 높아져.
우리가 보니깐  두 개의 1가 Cu 원자가 두 개의 Pb(1) 원자로 치환된 Pb8Cu2(PO4)6 추천함.


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