Unveiling the hidden nematicity and spin subsystem in FeSe

• Main Authors: 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
• Format: Article
• Language: English
• Published: Nature Publishing Group 2017-06-01
• Series: npj Quantum Materials
• Online Access: https://doi.org/10.1038/s41535-017-0036-5

Iron-based superconductors: Hidden nematic and magnetic fluctuations in iron selenide Ultrafast spectroscopy unveils hidden nematic fluctuations and a spin subsystem in the iron-based superconductor iron selenide. Layered iron-based materials recently emerged as a new class of high temperature superconductor. The mechanism of superconductivity in these materials, however, is a contentious issue. Nematic ordering is thought to be a key ingredient, but the apparent absence of magnetic ordering in iron selenide, which is the iron-based superconductor with the simplest structure, has caused confusion over what drives the nematicity. An international team of researchers led by Chih-Wei Luo and Jenh-Yih Juang from National Chiao Tung University use polarized ultrafast spectroscopy to unveil a hidden spin subsystem in FeSe, along with both nematic and magnetic fluctuations at relatively high temperatures, providing insights into the driving factors of nematicity in this fascinating material.