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Questioning the existence of superconducting potassium doped phases for aromatic hydrocarbons

Satoshi Heguri, Mototada Kobayashi, and Katsumi Tanigaki
Phys. Rev. B 92, 014502 – Published 7 July 2015

Abstract

Superconductivity in aromatic hydrocarbons doped with potassium (K) such as K3 [picene (PCN)] and K3 [phenanthrene (PHN)] is found for only armchair-type polycyclic aromatic hydrocarbon. In this paper the thermodynamics of the reaction processes of PHN or anthracene (AN, zigzag type) with K was studied using differential scanning calorimetry and x-ray diffraction. We show that PHN decomposes during the reaction, triggered by hydrogen abstraction, to give metal hydride KH and unknown amorphous. No stable doped phases exist in Kx(PHN) with stoichiometries of x=13. However, in the case of AN, a stable doped phase forms. We claim that PHN, which has been reported to be energetically more stable in the ground state than AN by first principle calculations, is unstable upon doping. We also suggest that the superconductivity in K3(PCN) is due to the misinterpretation of experimental data, which actually arises from ferromagnetic impurities. We have never detected the superconductivity above 2 K in these compounds. The superconductivity in both Kx(PHN) and Kx(PCN) is concluded to be highly questionable.

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  • Received 30 May 2015

DOI:https://doi.org/10.1103/PhysRevB.92.014502

©2015 American Physical Society

Authors & Affiliations

Satoshi Heguri1,*, Mototada Kobayashi2,*, and Katsumi Tanigaki1,3,*

  • 1World Premier International Research Center Initiative Advanced Institute for Materials Research (WPI-AIMR), Tohoku University, 2-1-1 Katahira, Aoba-ku, Sendai 980-8577, Japan
  • 2Graduate School of Material Science, University of Hyogo, 3-2-1 Kouto, Kamigohri, Hyogo 678-1297, Japan
  • 3Graduate School of Science, Tohoku University, 6-3 Aramaki, Aoba-ku, Sendai 980-8578, Japan

  • *Corresponding authors: heguri@sspns.phys.tohoku.ac.jp; kobayasi@sci.u-hyogo.ac.jp; tanigaki@sspns.phys.tohoku.ac.jp

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Vol. 92, Iss. 1 — 1 July 2015

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