Papers

Nov, 2016

Chemical analysis of superconducting phase in K-doped picene

JOURNAL OF PHYSICS-CONDENSED MATTER
  • Takashi Kambe
  • Saki Nishiyama
  • Huyen L. T. Nguyen
  • Takahiro Terao
  • Masanari Izumi
  • Yusuke Sakai
  • Lu Zheng
  • Hidenori Goto
  • Yugo Itoh
  • Taiki Onji
  • Tatsuo C. Kobayashi
  • Hisako Sugino
  • Shin Gohda
  • Hideki Okamoto
  • Yoshihiro Kubozono
  • Display all

Volume
28
Number
44
Language
English
Publishing type
Research paper (scientific journal)
DOI
10.1088/0953-8984/28/44/444001
Publisher
IOP PUBLISHING LTD

Potassium-doped picene (K(3.0)picene) with a superconducting transition temperature (TC) 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 TC 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.

Link information
DOI
https://doi.org/10.1088/0953-8984/28/44/444001
Web of Science
https://gateway.webofknowledge.com/gateway/Gateway.cgi?GWVersion=2&SrcAuth=JSTA_CEL&SrcApp=J_Gate_JST&DestLinkType=FullRecord&KeyUT=WOS:000395323800001&DestApp=WOS_CPL
ID information
  • DOI : 10.1088/0953-8984/28/44/444001
  • ISSN : 0953-8984
  • eISSN : 1361-648X
  • Web of Science ID : WOS:000395323800001

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