Unveiling the hidden nematicity and spin subsystem in FeSe

Chih-Wei Luo*, Po Chung Cheng, Shun Hung Wang, Jen Che Chiang, Jiunn-Yuan Lin, Kaung-Hsiung Wu, Jenh-Yih Juang, Dmitry A. Chareev, Olga S. Volkova, Alexander N. Vasiliev

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

34 Scopus citations


The nematic order (nematicity) is considered as one of the essential ingredients to understand the mechanism of Fe-based superconductivity. In most Fe-based superconductors (pnictides), nematic order is reasonably close to the antiferromagnetic order. In FeSe, in contrast, a nematic order emerges below the structure phase transition at T s = 90 K with no magnetic order. The case of FeSe is of paramount importance to a universal picture of Fe-based superconductors. The polarized ultrafast spectroscopy provides a tool to probe simultaneously the electronic structure and the magnetic interactions through quasiparticle dynamics. Here we show that this approach reveals both the electronic and magnetic nematicity below and, surprisingly, its fluctuations far above T s to at least 200 K. The quantitative pump-probe data clearly identify a correlation between the topology of the Fermi surface and the magnetism in all temperature regimes, thus providing profound insight into the driving factors of nematicity in FeSe and the origin of its uniqueness.

Original languageEnglish
Article number32
Number of pages6
Journalnpj Quantum Materials
Issue number1
StatePublished - 28 Jun 2017




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