Superconductivity in A1.5phenanthrene (A=Sr,Ba)
X. F. Wang, Y. J. Yan, Z. Gui, R. H. Liu, J. J. Ying, X. G. Luo, X. H. Chen
DOI 10.1103/PhysRevB.84.214523 · Physical Review B
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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 7cm−1/electron downshifts for the mode at 1441cm−1 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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