Tuning the electronic states and superconductivity in alkali fulleride films

Ren，Ming Qiang1; Wang，Shu Ze1; Han，Sha1; Song，Can Li1,2; Ma，Xu Cun1,2; Xue，Qi Kun1,2,3,4

2022-12-01

10.1007/s43673-021-00031-2

AAPPS Bulletin   Impact Factor & Quartile

0218-2203

2309-4710

The successful preparation of superconducting alkali fulleride (AC, A = K, Rb, Cs) films using state-of-the-art molecular beam epitaxy overcomes the disadvantages of the air-sensitivity and phase separation in bulk AC, enabling for the first time a direct investigation of the superconductivity in alkali fullerides on the molecular scale. In this paper, we briefly review recent cryogenic scanning tunneling microscopy results of the structural, electronic, and superconducting properties of the fcc AC films grown on graphitized SiC substrates. Robust s-wave superconductivity is revealed against the pseudogap, electronic correlation, non-magnetic impurities, and merohedral disorder. By controlling the alkali-metal species, film thickness, and electron doping, we systematically tune the C orientational orderings and superconductivity in AC films and then complete a unified phase diagram of superconducting gap size vs electronic correlation and doping. These investigations are conclusive and elucidated that the s-wave superconductivity retains in alkali fullerides despite of the electronic correlation and presence of pseudogap.

English

Others

Postdoctoral Research Foundation of China[2021T140388];

2-s2.0-85144642105

Scopus

1.State Key Laboratory of Low-Dimensional Quantum Physics,Department of Physics,Tsinghua University,Beijing,100084,China
2.Frontier Science Center for Quantum Information,Beijing,100084,China
3.Beijing Academy of Quantum Information Sciences,Beijing,100193,China
4.Southern University of Science and Technology,Shenzhen,518055,China

Ren，Ming Qiang,Wang，Shu Ze,Han，Sha,et al. Tuning the electronic states and superconductivity in alkali fulleride films[J]. AAPPS Bulletin,2022,32(1).

Ren，Ming Qiang,Wang，Shu Ze,Han，Sha,Song，Can Li,Ma，Xu Cun,&Xue，Qi Kun.(2022).Tuning the electronic states and superconductivity in alkali fulleride films.AAPPS Bulletin,32(1).

Ren，Ming Qiang,et al."Tuning the electronic states and superconductivity in alkali fulleride films".AAPPS Bulletin 32.1(2022).