Superconductivity in aromatic hydrocarbons

Yoshihiro Kubozono, Hidenori Goto, Taihei Jabuchi, Takayoshi Yokoya, Takashi Kambe, Yusuke Sakai, Masanari Izumi, Lu Zheng, Shino Hamao, Huyen L T Nguyen, Masafumi Sakata, Tomoko Kagayama, Katsuya Shimizu

Research output: Contribution to journalArticle

17 Citations (Scopus)

Abstract

'Aromatic hydrocarbon' implies an organic molecule that satisfies the (4n + 2) π-electron rule and consists of benzene rings. Doping solid aromatic hydrocarbons with metals provides the superconductivity. The first discovery of such superconductivity was made for K-doped picene (Kxpicene, five benzene rings). Its superconducting transition temperatures (Tc's) were 7 and 18 K. Recently, we found a new superconducting Kxpicene phase with a Tc as high as 14 K, so we now know that Kxpicene possesses multiple superconducting phases. Besides Kxpicene, we discovered new superconductors such as Rbxpicene and Caxpicene. A most serious problem is that the shielding fraction is ≤15% for Kxpicene and Rbxpicene, and it is often ∼1% for other superconductors. Such low shielding fractions have made it difficult to determine the crystal structures of superconducting phases. Nevertheless, many research groups have expended a great deal of effort to make high quality hydrocarbon superconductors in the five years since the discovery of hydrocarbon superconductivity. At the present stage, superconductivity is observed in certain metal-doped aromatic hydrocarbons (picene, phenanthrene and dibenzopentacene), but the shielding fraction remains stubbornly low. The highest priority research area is to prepare aromatic superconductors with a high superconducting volume-fraction. Despite these difficulties, aromatic superconductivity is still a core research target and presents interesting and potentially breakthrough challenges, such as the positive pressure dependence of Tc that is clearly observed in some phases of aromatic hydrocarbon superconductors, suggesting behavior not explained by the standard BCS picture of superconductivity. In this article, we describe the present status of this research field, and discuss its future prospects.

Original languageEnglish
Pages (from-to)199-205
Number of pages7
JournalPhysica C: Superconductivity and its Applications
Volume514
DOIs
Publication statusPublished - Jul 15 2015

Fingerprint

Aromatic Hydrocarbons
Aromatic hydrocarbons
Superconductivity
superconductivity
hydrocarbons
Superconducting materials
Shielding
shielding
Hydrocarbons
Benzene
Metals
benzene
phenanthrene
rings
metals
pressure dependence
Superconducting transition temperature
Volume fraction
Crystal structure
transition temperature

Keywords

  • Aromatic hydrocarbon
  • Physical properties
  • Structure
  • Superconductivity

ASJC Scopus subject areas

  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Energy Engineering and Power Technology
  • Electronic, Optical and Magnetic Materials

Cite this

Superconductivity in aromatic hydrocarbons. / Kubozono, Yoshihiro; Goto, Hidenori; Jabuchi, Taihei; Yokoya, Takayoshi; Kambe, Takashi; Sakai, Yusuke; Izumi, Masanari; Zheng, Lu; Hamao, Shino; Nguyen, Huyen L T; Sakata, Masafumi; Kagayama, Tomoko; Shimizu, Katsuya.

In: Physica C: Superconductivity and its Applications, Vol. 514, 15.07.2015, p. 199-205.

Research output: Contribution to journalArticle

Kubozono, Y, Goto, H, Jabuchi, T, Yokoya, T, Kambe, T, Sakai, Y, Izumi, M, Zheng, L, Hamao, S, Nguyen, HLT, Sakata, M, Kagayama, T & Shimizu, K 2015, 'Superconductivity in aromatic hydrocarbons', Physica C: Superconductivity and its Applications, vol. 514, pp. 199-205. https://doi.org/10.1016/j.physc.2015.02.015
Kubozono, Yoshihiro ; Goto, Hidenori ; Jabuchi, Taihei ; Yokoya, Takayoshi ; Kambe, Takashi ; Sakai, Yusuke ; Izumi, Masanari ; Zheng, Lu ; Hamao, Shino ; Nguyen, Huyen L T ; Sakata, Masafumi ; Kagayama, Tomoko ; Shimizu, Katsuya. / Superconductivity in aromatic hydrocarbons. In: Physica C: Superconductivity and its Applications. 2015 ; Vol. 514. pp. 199-205.
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