Nematic magnetoelastic effect contrasted between Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ 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 $C_4$-symmetry breaking, in BaFe${}_2$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 BaFe${}_2$As${}_2$, but unlike BaFe${}_2$As${}_2$ it has no long-range magnetic order. We find that the $E_g$ phonon-energy split in FeSe sets in only well below $T_{\mathrm{s}}$, and its saturated value is substantially smaller than that in BaFe${}_2$As${}_2$. Together with reported results for the Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ family, the data suggest that magnetism exerts a major influence on the lattice.

4 pages, 4 figures

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Cited by in corpus (8)

• An Electronic Nematic Liquid in BaNi${}_2$As${}_2$
• Origin of diverse nematic orders in Fe-based superconductors: 45${}^{\circ }$ rotated nematicity in AFe${}_2$As${}_2$ (A=Cs, Rb)
• Hidden antiferro-nematic order in Fe-based superconductor BaFe${}_2$As${}_2$ and NaFeAs above $T_S$
• On the phonon dispersion relation of single-crystalline $\beta$--FeSe
• Observation of Ising spin-nematic order and its close relationship to the superconductivity in FeSe single crystals
• Raman scattering study of tetragonal magnetic phase in Sr${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$: structural symmetry and electronic gap
• Laser-induced coherent control of an electronic nematic quantum phase transition
• Nematic fluctuations in the non-superconducting iron pnictide BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$