Nematic magnetoelastic effect contrasted betweenBa(Fe1−xCox)2As2and FeSe
| Autor: | Shigeru Kasahara, Yan Zhang, Yuwen Hu, Rui Zhang, Pengcheng Dai, Yuji Matsuda, Yuan Li, Takasada Shibauchi, Tatsuya Watashige, Xiao Ren, Huiqian Luo |
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| Rok vydání: | 2016 |
| Předmět: | |
| Zdroj: | Physical Review B. 93 |
| ISSN: | 2469-9969 2469-9950 |
| DOI: | 10.1103/physrevb.93.060504 |
| Popis: | 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 ${C}_{4}$-symmetry breaking, in ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$ and FeSe. FeSe possesses a nematic ordering temperature ${T}_{\mathrm{s}}$ and orbital-related band-energy split below ${T}_{\mathrm{s}}$ that are similar to those in ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$, but unlike ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$ it has no long-range magnetic order. We find that the ${E}_{g}$ phonon-energy split in FeSe becomes substantial only well below ${T}_{\mathrm{s}}$, and its saturated value is much smaller than that in ${\mathrm{BaFe}}_{2}{\mathrm{As}}_{2}$. Together with reported results for the $\mathrm{Ba}({\mathrm{Fe}}_{1\ensuremath{-}x}{\mathrm{Co}}_{x}{)}_{2}{\mathrm{As}}_{2}$ family, the data suggest that magnetism exerts a major influence on the lattice. |
| Databáze: | OpenAIRE |
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