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

Research output: Contribution to journalArticle

4 Citations (Scopus)

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

Fingerprint

chemical analysis
X rays
Shielding
fragments
Chemical analysis
musculoskeletal system
Spectroscopy
shielding
Superconducting transition temperature
Potassium
Volume fraction
Contamination
Diffraction
Annealing
pressure dependence
x ray spectroscopy
potassium
chemical composition
contamination
x ray diffraction

Keywords

  • hydrocarbon
  • picene
  • superconductivity

ASJC Scopus subject areas

  • Materials Science(all)
  • Condensed Matter Physics

Cite this

Chemical analysis of superconducting phase in K-doped picene. / Kambe, Takashi; Nishiyama, Saki; Nguyen, Huyen L T; Terao, Takahiro; Izumi, Masanari; Sakai, Yusuke; Zheng, Lu; Goto, Hidenori; Itoh, Yugo; Onji, Taiki; Kobayashi, Tatsuo; Sugino, Hisako; Gohda, Shin; Okamoto, Hideki; Kubozono, Yoshihiro.

In: Journal of Physics Condensed Matter, Vol. 28, No. 44, 444001, 08.09.2016.

Research output: Contribution to journalArticle

Kambe, T, Nishiyama, S, Nguyen, HLT, 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, vol. 28, no. 44, 444001. https://doi.org/10.1088/0953-8984/28/44/444001
Kambe, Takashi ; Nishiyama, Saki ; Nguyen, Huyen L T ; Terao, Takahiro ; Izumi, Masanari ; Sakai, Yusuke ; Zheng, Lu ; Goto, Hidenori ; Itoh, Yugo ; Onji, Taiki ; Kobayashi, Tatsuo ; Sugino, Hisako ; Gohda, Shin ; Okamoto, Hideki ; Kubozono, Yoshihiro. / Chemical analysis of superconducting phase in K-doped picene. In: Journal of Physics Condensed Matter. 2016 ; Vol. 28, No. 44.
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