Yan Jia-Feng, Zhong Guo-Hua, Wang Ren-Shu, Zhang Kai, Lin Hai-Qing, Chen Xiao-Jia
Center for High Pressure Science and Technology Advanced Research , Shanghai 201203 , China.
Shenzhen Institutes of Advanced Technology , Chinese Academy of Sciences, Shenzhen 518055 , China.
J Phys Chem Lett. 2019 Jan 3;10(1):40-47. doi: 10.1021/acs.jpclett.8b03263. Epub 2018 Dec 20.
To explore more novel superconductors, we have synthesized the potassium-doped p-quaterphenyl by an annealing or just a pestling process. The Meissner effect with critical temperatures ranging from 3.5 to 120 K is found by the magnetic susceptibility measurements in doped samples. The primary superconducting phase with a critical temperature of 7.2 K can be duplicated in the annealed and pestled samples. The charge transfer from metal to molecule is confirmed from the Raman scattering measurements. The X-ray diffraction analysis suggests that the low-temperature superconducting phase is due to the two-electron doping, whereas the high-temperature one corresponds to the high doping content. The occurrence of superconductivity in potassium-doped p-quaterphenyl supports the chain link organic molecules as promising candidates for high-temperature superconductors. This work also provides a simple method for synthesizing organic superconductors by pestling without annealing.
为了探索更多新型超导体，我们通过退火或仅仅研磨的方法合成了钾掺杂的对四联苯。通过对掺杂样品进行磁化率测量，发现了临界温度在3.5至120 K范围内的迈斯纳效应。在退火和研磨后的样品中可以重现临界温度为7.2 K的主要超导相。拉曼散射测量证实了从金属到分子的电荷转移。X射线衍射分析表明，低温超导相是由于双电子掺杂，而高温超导相则对应于高掺杂含量。钾掺杂对四联苯中超导现象的出现支持了链状连接有机分子作为高温超导体的有前途的候选者。这项工作还提供了一种无需退火通过研磨合成有机超导体的简单方法。
