Synthesis and physical properties of metal-doped picene solids

Takashi Kambe, Xuexia He, Yosuke Takahashi, Yusuke Yamanari, Kazuya Teranishi, Hiroki Mitamura, Seiji Shibasaki, Keitaro Tomita, Ritsuko Eguchi, Hidenori Goto, Yasuhiro Takabayashi, Takashi Kato, Akihiko Fujiwara, Toshikaze Kariyado, Hideo Aoki, Yoshihiro Kubozono

研究成果: Article査読

48 被引用数 (Scopus)

抄録

We report electronic-structure and physical properties of metal-doped picene as well as selective synthesis of the phase that exhibits 18-K superconducting transition. First, Raman scattering is used to characterize the number of electrons transferred from the dopants to picene molecules, where a softening of Raman scattering peaks enables us to determine the number of transferred electrons. From this, we have identified that three electrons are transferred to each picene molecule in the superconducting doped picene solids. Second, we report pressure dependence of Tc in 7- and 18-K phases of K3picene. The 7-K phase shows a negative pressure dependence, while the 18-K phase exhibits a positive pressure dependence which can not be understood with a simple phonon mechanism of BCS superconductivity. Third, we report a synthesis method for superconducting K3picene by a solution process with monomethylamine CH3NH2. This method enables us to prepare selectively the K3picene sample exhibiting 18-K superconducting transition. The method for preparing K3picene with Tc = 18 K found here may facilitate clarification of the mechanism of superconductivity.

本文言語English
論文番号214507
ジャーナルPhysical Review B - Condensed Matter and Materials Physics
86
21
DOI
出版ステータスPublished - 2012 12月 17
外部発表はい

ASJC Scopus subject areas

  • 電子材料、光学材料、および磁性材料
  • 凝縮系物理学

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