@article{d57ddad5f99040b39e3dbce9111eda1f,
title = "Nematic magnetoelastic effect contrasted between Ba(Fe1-xCox)2As2 and FeSe",
abstract = "To elucidate the origin of nematic order in Fe-based superconductors, we report a Raman scattering study of lattice dynamics, which quantify the extent of C4-symmetry breaking, in BaFe2As2 and FeSe. FeSe possesses a nematic ordering temperature Ts and orbital-related band-energy split below Ts that are similar to those in BaFe2As2, but unlike BaFe2As2 it has no long-range magnetic order. We find that the Eg phonon-energy split in FeSe becomes substantial only well below Ts, and its saturated value is much smaller than that in BaFe2As2. Together with reported results for the Ba(Fe1-xCox)2As2 family, the data suggest that magnetism exerts a major influence on the lattice.",
author = "Yuwen Hu and Xiao Ren and Rui Zhang and Huiqian Luo and Shigeru Kasahara and Tatsuya Watashige and Takasada Shibauchi and Pengcheng Dai and Yan Zhang and Yuji Matsuda and Yuan Li",
note = "Funding Information: We wish to thank F. Wang, D.-H. Lee, and Elbio Dagotto for stimulating discussions. Work at Peking University is supported by NSFC (Grants No. 11374024 and No. 11522429) and MOST of China (Grants No. 2013CB921903 and No. 2015CB921302). Work at the IOP, Chinese Academy of Sciences, is supported by MOST of China (No. 2011CBA00110 and No. 2015CB921302), NSFC (No. 11374011 and No. 91221303), and Chinese Academy of Sciences (SPRP-B: XDB07020300). Work at Rice University is supported by the US NSF, No. DMR-1436006 and No. DMR-1308603, and in part by the Robert A. Welch Foundation under Grant No. C-1839. Y.H. and X.R. contributed equally to this work. Publisher Copyright: {\textcopyright} 2016 American Physical Society.",
year = "2016",
month = feb,
day = "2",
doi = "10.1103/PhysRevB.93.060504",
language = "English",
volume = "93",
journal = "Physical Review B",
issn = "2469-9950",
publisher = "American Physical Society",
number = "6",
}