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 C. Kobayashi; Hisako Sugino; Shin Gohda; Hideki Okamoto; Yoshihiro Kubozono

doi:10.1088/0953-8984/28/44/444001

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 C. Kobayashi, Hisako Sugino, Shin Gohda, Hideki Okamoto, Yoshihiro Kubozono

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8 Citations (Scopus)

Abstract

Potassium-doped picene (K_3.0picene) 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 language	English
Article number	444001
Journal	Journal of Physics Condensed Matter
Volume	28
Issue number	44
DOIs	https://doi.org/10.1088/0953-8984/28/44/444001
Publication status	Published - Sep 8 2016

Keywords

hydrocarbon
picene
superconductivity

ASJC Scopus subject areas

Materials Science(all)
Condensed Matter Physics

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10.1088/0953-8984/28/44/444001

Cite this

@article{faf49149f5d442678907a1d0c09081c5,

title = "Chemical analysis of superconducting phase in K-doped picene",

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.",

keywords = "hydrocarbon, picene, superconductivity",

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

note = "Funding Information: This study was partly supported by Grants-in-Aid (22244045, 24654105, 26105004, 22013012 and 23340104) from MEXT, by the LEMSUPER project (JST-EU Superconductor Project) and the ACT-C project of the Japan Science and Technology Agency (JST), and by the Program for Promoting the Enhancement of Research Universities of MEXT. Publisher Copyright: {\textcopyright} 2016 IOP Publishing Ltd.",

year = "2016",

month = sep,

day = "8",

doi = "10.1088/0953-8984/28/44/444001",

language = "English",

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T1 - Chemical analysis of superconducting phase in K-doped picene

AU - Kambe, Takashi

AU - Nishiyama, Saki

AU - Nguyen, Huyen L.T.

AU - Terao, Takahiro

AU - Izumi, Masanari

AU - Sakai, Yusuke

AU - Zheng, Lu

AU - Goto, Hidenori

AU - Itoh, Yugo

AU - Onji, Taiki

AU - Kobayashi, Tatsuo C.

AU - Sugino, Hisako

AU - Gohda, Shin

AU - Okamoto, Hideki

AU - Kubozono, Yoshihiro

N1 - Funding Information: This study was partly supported by Grants-in-Aid (22244045, 24654105, 26105004, 22013012 and 23340104) from MEXT, by the LEMSUPER project (JST-EU Superconductor Project) and the ACT-C project of the Japan Science and Technology Agency (JST), and by the Program for Promoting the Enhancement of Research Universities of MEXT. Publisher Copyright: © 2016 IOP Publishing Ltd.

PY - 2016/9/8

Y1 - 2016/9/8

N2 - 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.

AB - 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.

KW - hydrocarbon

KW - picene

KW - superconductivity

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JF - Journal of Physics Condensed Matter

SN - 0953-8984

IS - 44

M1 - 444001

ER -

Chemical analysis of superconducting phase in K-doped picene

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Keywords

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