Superconductivity in A1.5phenanthrene (A=Sr,Ba)

X. F. Wang, Y. J. Yan, Z. Gui, R. H. Liu, J. J. Ying, X. G. Luo, and X. H. Chen
Phys. Rev. B 84, 214523 – Published 20 December 2011

Abstract

We discover superconductivity in alkali-earth metal-doped phenanthrene. The superconducting critical temperatures Tc are 5.6 and 5.4 K for Sr1.5phenanthrene and Ba1.5phenanthrene, respectively. The shielding fraction of Ba1.5phenanthrene exceeds 65%. The Raman spectra show 8 and 7cm1/electron downshifts for the mode at 1441cm1 due to the charge transfer to organic molecules from the dopants of Ba and Sr. Similar behavior has been observed in A3phenanthrene and A3C60(A=KandRb). The positive-pressure effect in Sr1.5phenanthrene and Ba1.5phenanthrene together with the lower Tc with a larger lattice indicates unconventional superconductivity in this organic system.

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  • Received 24 October 2011

DOI:https://doi.org/10.1103/PhysRevB.84.214523

©2011 American Physical Society

Authors & Affiliations

X. F. Wang1, Y. J. Yan1, Z. Gui2, R. H. Liu1, J. J. Ying1, X. G. Luo1, and X. H. Chen1,*

  • 1Hefei National Laboratory for Physical Science at Microscale and Department of Physics, University of Science and Technology of China, Hefei, Anhui 230026, People's Republic of China
  • 2State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, China

  • *chenxh@ustc.edu.cn

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Vol. 84, Iss. 21 — 1 December 2011

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