兴奋剂
材料科学
Crystal(编程语言)
凝聚态物理
超导电性
电子
晶体结构
金属
化学物理
电子结构
费米能级
化学
结晶学
物理
计算机科学
量子力学
冶金
程序设计语言
作者
Guo‐Hua Zhong,Chao Zhang,Xun-Wang Yan,Xiaoguang Li,Zheng Du,Gexin Jing,Cencen Ma
标识
DOI:10.1080/00268976.2016.1274439
摘要
Polycyclic aromatic hydrocarbons doped by metal have exhibited the potential of high temperature superconductivity. Understanding the basic properties of materials is the key to reveal the superconductivity. Here, a systemically theoretical study has been done to explore crystal structures and electronic properties of pristine and potassium-doped 1,2;8,9-dibenzopentacene, compared with [7]phenacenes case. We determined that vdW-DF2 functional is more suitable to describe the non-local interaction in a molecular crystal. Based on this functional, we predicted the crystal structures and investigated in detail the K atomic positions in a system. It was found that the intralayer doping leads to lower total energy. From the calculated formation energy, for each 1,2;8,9-dibenzopentacene molecule, the doping of two electrons is more stable under the relatively K-poor condition while the doping of four electrons is more stable under the K-rich condition. Between these two phases, the three-electron doping phase stabilises in a narrow region of K chemical potential. Combining with the electronic states at Fermi level, we analysed the reasons of superconductivity enhancement in doped 1,2;8,9-dibenzopentacene. This work further deepens the understanding of 1,2;8,9-dibenzopentacene superconductor.
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