Nov, 2016
Chemical analysis of superconducting phase in K-doped picene
JOURNAL OF PHYSICS-CONDENSED MATTER
- 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
- ID information
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- DOI : 10.1088/0953-8984/28/44/444001
- ISSN : 0953-8984
- eISSN : 1361-648X
- Web of Science ID : WOS:000395323800001