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Observation of orbital ordering and origin of the nematic order in FeSeстатья
Статья опубликована в высокорейтинговом журнале
Статья опубликована в журнале из списка Web of Science и/или Scopus- Авторы: Rongxing Cao, Jian Hu, Jun Dong, Jinbo Zhang, Xiaoshan Ye, Yafang Xu, Dmitry Chareev, Vasiliev Alexander N., Bing Wu, Xianghua Zeng, Qiuliang Wang and Guoqing Wu
- Журнал: New Journal of Physics
- Год издания: 2019
- Издательство: IOP Publishing
- Местоположение издательства: [Bristol, UK], England
- DOI: 10.1088/1367-2630/ab4927
- Аннотация: In iron-based superconductors the interactions driving the nematic order that breaks the lattice four-fold rotational symmetry in the iron plane may also facilitate the Cooper pairing, but experimental determination of these interactions is challenging because the temperatures of the nematic order and the order of other electronic phases appear to match each other or to be close to each other. Here we performed field-dependent $^{77}$Se-nuclear magnetic resonance (NMR) measurements on single crystals of iron-based superconductor FeSe, with magnetic field $B_{0}$ up to 16 T. The $^{77}$Se-NMR spectra and Knight shift split when the direction of $B_{0}$ is away from the direction perpendicular to the iron planes (i.e., $B_{0}$ $\parallel$ $c$) upon cooling in temperature, with a significant change in the distribution and magnitude of the internal magnetic field at the $^{77}$Se nucleus, but these do not happen when $B_{0}$ is perpendicular to the iron planes, thus demonstrating that there is an orbital ordering. Moreover, stripe-type antiferromagnetism is absent, while giant antiferromagnetic spin fluctuations measured by the NMR spin-lattice relaxation gradually developed starting at $\sim$ 40 K, which is far below the nematic order temperature $T_{\text{nem}}$ = 89 K. These results provide direct evidence of orbital-driven nematic order in FeSe.
- Добавил в систему: Чареев Дмитрий Александрович