论文标题
在rubidium掺杂的c $ _ {60} $中，稳健的超导率接近恒定温度
Robust superconductivity near constant temperature in rubidium-doped C$_{60}$
论文作者
论文摘要
为了在碱金属掺杂的c $ _ {60} $中建立兴奋剂依赖的相图，我们通过使用改进的湿化学技术来合并带有不同stoichiomerties的RB掺杂C $ _ {60} $样品。从拉曼散射光谱中确定的掺杂水平通常显示出三个电子的外观，无论使用哪种掺杂剂。与唯一的RB $ _ {3} $ C $ _ {60} $共存的多相共存，可以从精致的X射线衍射模式中标识。 RB $ _ {3} $ C $ _ {60} $的相位分数被发现与超导屏蔽分数相似的庄园中的掺杂行为。这些严格建立的超导过渡温度之间的相关性以及结构和声子振动属性使我们能够将RB $ _ {3} $ C $ _ {60} $作为唯一的超导阶段，这是唯一具有近乎恒定的过渡温度的超导阶段。这些发现对富勒斯的超导性的理论发展提供了实验限制。
To establish the doping-dependent phase diagram in alkali-metal doped C$_{60}$, we synthesize Rb-doped C$_{60}$ samples with different stoichiometries by using the improved wet-chemistry technique. The doping levels determined from the Raman scattering spectra often show the appearance of three electrons corresponding to the band filling of three for the synthesized compounds no matter matter what dopants are used. The multiple phase coexistence with the unique Rb$_{3}$C$_{60}$ is identified from the refined x-ray diffraction patterns. The phase fraction of Rb$_{3}$C$_{60}$ is found to behave with the doping in a similar manor as the superconducting shielding fraction. These rigorously established correlations among the superconducting transition temperature along with the structural and phonon vibrational properties allow us to single out Rb$_{3}$C$_{60}$ as the only superconducting phase with the nearly constant transition temperature regardless the doping level. These findings provide an experimental constraint on the theory developments for the superconductivity in fullerides.
