芳香超导体:电-声耦合与电子关联  

Aromatic superconductors:Electron-phonon coupling and electronic correlations

作　　者：钟国华[1] 林海青 Zhong Guo-Hua;Lin Hai-Qing(Shenzhen Institute of Advanced Technology,Chinese Academy of Sciences,Shenzhen 518055,China;School of Physics,Zhejiang University,Hangzhou 310058,China)

机构地区：[1]中国科学院深圳先进技术研究院,深圳518055 [2]浙江大学物理学院,杭州310058

出　　处：《物理学报》2023年第23期79-85,共7页Acta Physica Sinica

基　　金：国家自然科学基金(批准号:12088101,12074401)资助的课题。

摘　　要：芳香超导体是近年来发现的一类新型高温超导体,超导转变温度随芳香分子尺寸的增大而升高,这引起了的实验和理论研究的广泛关注.关于其超导特性的驱动机制是电-声耦合还是电子关联效应等相关问题吸引了国内外研究组的极大兴趣.本文简述了芳香超导体的研究进展,介绍了金属掺杂芳香化合物后展现出的丰富超导现象,从电-声耦合和电子关联角度,讨论了国内外研究组对芳香化合物超导性的理解,及其对探索具有更高转变温度的芳香高温超导体的意义,最后介绍了目前领域内面临的挑战.Aromatic superconductors are a new type of high-temperature superconductor discovered in recent years.The superconducting transition temperature(T_(c))increases with the size of aromatic molecule increasing,which has attracted widespread attention of experimental and theoretical researchers.The driving mechanism for such a superconductivity,whether it is dominated by electron-phonon coupling or electronic correlation effects,has aroused great interest of many research groups.This paper briefly introduces the rich superconducting phenomena of metal doped aromatic compounds.From the perspectives of electron-phonon coupling or electronic correlations,the superconductivity of aromatic compounds is discussed,which is helpful in exploring aromatic superconductors with higher T_(c).The challenges currently faced in the field are also introduced.The rest of this paper is organized as follows.We first introduce the existence of abundant superconducting phases in the experiment of metal doped aromatic compounds.Different doping concentrations of metal cause superconducting phases with different T_(c)values,especially the highest T_(c)value of the superconducting phase increases with the size of aromatic molecule increasing.Theoretical prediction shows that all aromatic hydrocarbon superconductors have a low-T_(c)superconducting phase in a range of 5-7 K,which is a common feature.For systems with few benzene rings(such as benzene,naphthalene,and phenanthrene crystals),only low-T_(c)phase of 5-7 K exists,while in systems with multiple benzene rings(such as picene,dibenzopentacene,and others with the number of benzene rings more than 5),there are multiple superconducting phases;the highest T_(c)in long-benzene-ring system depends not only on the number of benzene rings,but also on the chain size of organic molecule.Further research indicates that low-T_(c)phase is induced by doping about 2 electrons and has good stability,while high-T_(c)phase results from doping 3 electrons and has slightly poorer stability.Then,the electron

关 键 词：芳香超导体 超导电性 电-声耦合 电子关联 

分 类 号：O511.3[一般工业技术—材料科学与工程]