Chemical analysis of superconducting phase in K-doped picene

Takashi Kambe, Saki Nishiyama, Huyen L T Nguyen, Takahiro Terao, Masanari Izumi, Yusuke Sakai, Lu Zheng, Hidenori Goto, Yugo Itoh, Taiki Onji, Tatsuo Kobayashi, Hisako Sugino, Shin Gohda, Hideki Okamoto, Yoshihiro Kubozono

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Abstract

Potassium-doped picene (K3.0picene) with a superconducting transition temperature (T C) as high as 14 K at ambient pressure has been prepared using an annealing technique. The shielding fraction of this sample was 5.4% at 0 GPa. The T C showed a positive pressure-dependence and reached 19 K at 1.13 GPa. The shielding fraction also reached 18.5%. To investigate the chemical composition and the state of the picene skeleton in the superconducting sample, we used energy-dispersive x-ray (EDX) spectroscopy, MALDI-time-of-flight (MALDI-TOF) mass spectroscopy and x-ray diffraction (XRD). Both EDX and MALDI-TOF indicated no contamination with materials other than K-doped picene or K-doped picene fragments, and supported the preservation of the picene skeleton. However, it was also found that a magnetic K-doped picene sample consisted mainly of picene fragments or K-doped picene fragments. Thus, removal of the component contributing the magnetic quality to a superconducting sample should enhance the volume fraction.

Original languageEnglish
Article number444001
JournalJournal of Physics Condensed Matter
Volume28
Issue number44
DOIs
Publication statusPublished - Sep 8 2016

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Keywords

  • hydrocarbon
  • picene
  • superconductivity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Kambe, T., Nishiyama, S., Nguyen, H. L. T., Terao, T., Izumi, M., Sakai, Y., Zheng, L., Goto, H., Itoh, Y., Onji, T., Kobayashi, T., Sugino, H., Gohda, S., Okamoto, H., & Kubozono, Y. (2016). Chemical analysis of superconducting phase in K-doped picene. Journal of Physics Condensed Matter, 28(44), [444001]. https://doi.org/10.1088/0953-8984/28/44/444001