Abstract
We discover superconductivity in alkali-earth metal-doped phenanthrene. The superconducting critical temperatures are 5.6 and 5.4 K for phenanthrene and phenanthrene, respectively. The shielding fraction of phenanthrene exceeds 65. The Raman spectra show 8 and downshifts for the mode at due to the charge transfer to organic molecules from the dopants of Ba and Sr. Similar behavior has been observed in phenanthrene and . The positive-pressure effect in phenanthrene and phenanthrene together with the lower with a larger lattice indicates unconventional superconductivity in this organic system.
- Received 24 October 2011
DOI:https://doi.org/10.1103/PhysRevB.84.214523
©2011 American Physical Society