Influence of Spin-Orbit Coupling in Iron-Based Superconductors

Physical Review Letters
R P DayA Damascelli

Abstract

We report on the influence of spin-orbit coupling (SOC) in Fe-based superconductors via application of circularly polarized spin and angle-resolved photoemission spectroscopy. We combine this technique in representative members of both the Fe-pnictides (LiFeAs) and Fe-chalcogenides (FeSe) with tight-binding calculations to establish an ubiquitous modification of the electronic structure in these materials imbued by SOC. At low energy, the influence of SOC is found to be concentrated on the hole pockets, where the largest superconducting gaps are typically found. This effect varies substantively with the k_{z} dispersion, and in FeSe we find SOC to be comparable to the energy scale of orbital order. These results contest descriptions of superconductivity in these materials in terms of pure spin-singlet eigenstates, raising questions regarding the possible pairing mechanisms and role of SOC therein.

References

Aug 11, 2001·Physical Review Letters·T MizokawaY Maeno
Sep 30, 2009·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Paolo GiannozziRenata M Wentzcovitch
May 9, 2015·Physical Review Letters·P D JohnsonA V Fedorov
Aug 6, 2016·Physical Review Letters·Gang XuShou-Cheng Zhang
Nov 24, 2016·Reports on Progress in Physics·Rafael M Fernandes, Andrey V Chubukov

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Citations

Oct 22, 2019·Physical Review Letters·Chong WangWenhui Duan
Aug 13, 2021·Journal of Physics. Condensed Matter : an Institute of Physics Journal·Die HuJun Zhao

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