Organic superconductors have π-molecular orbitals, from which electrons can become delocalized, giving rise to metallic conductivity due to orbital overlap between adjacent molecules. Here we report the discovery of superconductivity at a transition temperature (Tc) of ~5 K in alkali-metal-doped phenanthrene. A 1-GPa pressure leads to a 20% increase of Tc, suggesting that alkali-metal-doped phenanthrene shows unconventional superconductivity. Raman spectra indicate that alkali-metal doping injects charge into the system to realize the superconductivity. The discovery of superconductivity in A3phenanthrene (where A can be either K or Rb) produces a novel broad class of superconductors consisting of fused hydrocarbon benzene rings with π-electron networks. An increase of Tc with increasing number of benzene rings from three to five suggests that organic hydrocarbons with long chains of benzene rings are potential superconductors with high Tc.. ? 2011 Nature Publishing Group, a division of Macmillan Publishers Limited. All Rights Reserved.
展开▼
机译:有机超导体具有π分子轨道,电子可以从π分子轨道移离,由于相邻分子之间的轨道重叠而产生金属电导率。在这里,我们报告了在碱金属掺杂菲中在〜5 K的转变温度(T c sub>)处发现超导的发现。 1-GPa压力导致T c sub>增加20%,表明碱金属掺杂的菲表现出非常规的超导性。拉曼光谱表明,碱金属掺杂向系统中注入电荷以实现超导性。在A 3 sub>菲(其中A可以是K或Rb)中发现超导性会产生一类新型的超导体,它由具有π电子网络的稠合烃苯环组成。随着苯环数目从3增加到5,T 的增加表明,苯环长链的有机烃是T c sub>较高的潜在超导体。 2011年自然出版集团(Macmillan Publishers Limited的子公司)。版权所有。
展开▼