Low-temperature scanning tunneling microscopy / spectroscopy of pristine and alkali-metal doped Picene thin films formed on a noble metal surface
Hung-Hsiang Yang3, Hsu-Sheng Huang4, Shu-You Guan4, Susumu Yanagisawa5, Takuya Yokosuka1, Minn-Tsong Lin3, Wei-Bin Su4, Chia-Seng Chang4, Yasuo Yoshida1, Germar Hoffmann2*, Yukio Hasegawa1
1ISSP, Tokyo University, Tokyo, Japan
2Dept. of Phys., NTHU, Hsinchu, Taiwan
3Dept. of Phys., NTU, Taipei, Taiwan
4Inst. of Physi., Academia Sinica, Taipei, Taiwan
5Dept. of Phys., Ryukus University, Nishihara, Japan
* presenting author:Germar Hoffmann, email:germar.hoffmann@googlemail.com
K3-picene is an organic superconductor with TC=19 K as reported for bulk samples [1]. The underlying physical processes of the superconducting state are not yet fully revealed because the high reactivity in the air limits experimental accesses. Here, we report on in-situ low-temperature scanning tunneling microscopy and spectroscopy of pristine and potassium doped picene ultrathin films grown under ultrahigh vacuum conditions on a metal substrate. The structure of grown films and their electronic properties before and after doping with alkali metals are investigated and presented.

References:
1) R. Mitsuhashi et al., Nature 464, 76 (2010)


Keywords: Molecular Superconductivity, Molecular Electronics, Scanning Tunneling Microscopy, Scanning Tunneling Spectroscopy, Surface Science