Unconventional Pairing from Local Orbital Fluctuations in Strongly Correlated A$_3$C$_{60}$
Abstract
The pairing mechanism in AC 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.
Keywords
Cite
@article{arxiv.2103.08925,
title = {Unconventional Pairing from Local Orbital Fluctuations in Strongly Correlated A$_3$C$_{60}$},
author = {Changming Yue and Shintaro Hoshino and Akihisa Koga and Philipp Werner},
journal= {arXiv preprint arXiv:2103.08925},
year = {2021}
}
Comments
5+3 pages, 5+7 figures