Superconductivity in alkali-earth metals doped phenanthrene
| Autor: | Wang, X. F., Yan, Y. J., Gui, Z., Liu, R. H., Ying, J. J., Luo, X. G., Chen, X. H. |
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| Rok vydání: | 2011 |
| Předmět: | |
| Zdroj: | Phys. Rev. B 84, 214523 (2011) |
| Druh dokumentu: | Working Paper |
| DOI: | 10.1103/PhysRevB.84.214523 |
| Popis: | We discover superconductivity in alkali-earth metals doped phenanthrene. The superconducting critical temperatures \emph{T}$_c$ are 5.6 K and 5.4 K for Sr$_{1.5}$phenanthrene and Ba$_{1.5}$phenanthrene, respectively. The shielding fraction of Ba$_{1.5}$phenanthrene 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 A$_3$phenanthrene and A$_3$C$_{60}$(A = K and Rb). The positive pressure effect in Sr$_{1.5}$phenanthrene and Ba$_{1.5}$phenanthrene together with the lower $T_c$ with larger lattice indicates unconventional superconductivity in this organic system. Comment: 4 pages, 4 figures |
| Databáze: | arXiv |
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