半面体无序和杂质对富勒烯超导电性的影响
Merohedral disorder and impurity impacts on superconductivity of fullerenes
摘要：
杂质周围的局部准粒子态为非常规超导机制提供了重要的见解，特别是当候选材料接近反铁磁Mott绝缘相时。虽然这种状态已经在基于原子的铜酸盐和铁基化合物中报道，但它们在具有可调分子取向的有机超导体中尚未探索。在这里，我们采用扫描隧道显微镜和光谱，以揭示多种形式的鲁棒性的外来$s$波超导性在外延Rb $_3$ C $_{60}$膜对半面体无序，非磁性单一杂质和台阶边缘在原子尺度。还观察到Yu-Shiba-Rusinov（YSR）状态诱导的故意引起的Fe吸附原子作为磁散射。束缚态显示突然的空间衰减和变化的能量与Fe吸附原子注册表。我们的结果和普遍的最佳超导半填充点对本地电子配对，其中多轨道电子关联和分子内声子一起驱动掺杂富勒烯的高温超导性。
英文摘要：
Local quasiparticle states around impurities provide essential insight into the mechanism of unconventional superconductivity, especially when the candidate materials are proximate to an antiferromagnetic Mott-insulating phase. While such states have been reported in atom-based cuprates and iron-based compounds, they are unexplored in organic superconductors which feature tunable molecular orientation. Here we employ scanning tunneling microscopy and spectroscopy to reveal multiple forms of robustness of an exotic $s$-wave superconductivity in epitaxial Rb$_3$C$_{60}$ films against merohedral disorder, non-magnetic single impurities and step edges at the atomic scale. Also observed have been Yu-Shiba-Rusinov (YSR) states induced by deliberately incurred Fe adatoms that act as magnetic scatters. The bound states display abrupt spatial decay and vary in energy with the Fe adatom registry. Our results and the universal optimal superconductivity at half-filling point towards local electron pairing in which the multiorbital electronic correlations and intramolecular phonons together drive the high-temperature superconductivity of doped fullerenes.
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