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arXiv 2103.08925cond-mat.str-elcond-mat.supr-con
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强关联A-$_3$ C $_{60}$中局域轨道涨落的非常规配对

Unconventional Pairing from Local Orbital Fluctuations in Strongly Correlated A$_3$C$_{60}$

Changming Yue, Shintaro Hoshino, Akihisa Koga, Philipp Werner

摘要:

本文通过研究具有反铁磁Hund耦合的三轨道哈伯德模型在正常相和超导相中的性质,研究了A $_3$ C $_{60}$中的配对机制.局部轨道波动被证明是大大增强的超导状态,与波动的能量尺度相匹配的低能量峰值的序参量的谱权重。我们的研究结果表明,局域轨道涨落提供了配对胶在强关联富勒烯超导体和支持非常规超导的自旋/轨道冻结理论。它们也符合实验观察到的普遍关系的间隙能量和局部磁化率在广泛的非常规超导体。

英文摘要:

The pairing mechanism in A$_3$C$_{60}$ is investigated by studying the properties of a three-orbital Hubbard model with antiferromagnetic Hund coupling in the normal and superconducting phase. Local orbital fluctuations are shown to be substantially enhanced in the superconducting state, with a fluctuation energy scale that matches the low-energy peak in the spectral weight of the order parameter. Our results demonstrate that local orbital fluctuations provide the pairing glue in strongly correlated fulleride superconductors and support the spin/orbital freezing theory of unconventional superconductivity. They are also consistent with the experimentally observed universal relation between the gap energy and local susceptibility in a broad range of unconventional superconductors.

机构、总结、中文摘要均由AI分析而来,可能存在错误,请以论文正文为准。

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