Chemical analysis of superconducting phase in K-doped picene
| Autor: | Taiki Onji, Tatsuo C. Kobayashi, Masanari Izumi, Hisako Sugino, Takahiro Terao, Lu Zheng, Shin Gohda, Yusuke Sakai, Yoshihiro Kubozono, Saki Nishiyama, Hidenori Goto, Huyen Nguyen, Takashi Kambe, Yugo Itoh, Hideki Okamoto |
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| Rok vydání: | 2016 |
| Předmět: |
Superconductivity
Materials science Annealing (metallurgy) Doping Analytical chemistry 02 engineering and technology 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences chemistry.chemical_compound Picene chemistry 0103 physical sciences Volume fraction General Materials Science 010306 general physics 0210 nano-technology Spectroscopy Chemical composition Ambient pressure |
| Zdroj: | Journal of Physics: Condensed Matter. 28:444001 |
| ISSN: | 1361-648X 0953-8984 |
| DOI: | 10.1088/0953-8984/28/44/444001 |
| Popis: | 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. |
| Databáze: | OpenAIRE |
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