Superconductivity in alkali-earth metals doped phenanthrene
Abstract
We discover superconductivity in alkali-earth metals doped phenanthrene. The superconducting critical temperatures Tc are 5.6 K and 5.4 K for Sr1.5phenanthrene and Ba1.5phenanthrene, respectively. The shielding fraction of Ba1.5phenanthrene exceeds 65%. The Raman spectra show 8 cm-1/electron and 7 cm-1/electron downshifts for the mode at 1441 cm-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 = K and Rb). The positive pressure effect in Sr1.5phenanthrene and Ba1.5phenanthrene together with the lower Tc with larger lattice indicates unconventional superconductivity in this organic system.
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