Nematic crossover in BaFe${}_2$As${}_2$ under uniaxial stress

Abstract

Raman scattering can detect spontaneous point-group symmetry breaking without resorting to single-domain samples. Here we use this technique to study $\mathrm{BaF}{\mathrm{e}}_2\mathrm{A}{\mathrm{s}}_2$, the parent compound of the "122" Fe-based superconductors. We show that an applied compression along the Fe-Fe direction, which is commonly used to produce untwinned orthorhombic samples, changes the structural phase transition at temperature $T_{\mathrm{s}}$ into a crossover that spans a considerable temperature range above $T_{\mathrm{s}}$. Even in crystals that are not subject to any applied force, a distribution of substantial residual stress remains, which may explain phenomena that are seemingly indicative of symmetry breaking above $T_{\mathrm{s}}$. Our results are consistent with an onset of spontaneous nematicity only below $T_{\mathrm{s}}$.

4 pages, 4 figures

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Cited by in corpus (26)

• Electronic nematic susceptibility of iron-based superconductors
• Spin-orbit phase behaviors of Na2Co2TeO6 at low temperatures
• Impact of Uniaxial Pressure on Structural and Magnetic Phase Transitions in Electron-Doped Iron Pnictides
• An Electronic Nematic Liquid in BaNi${}_2$As${}_2$
• Local orthorhombic lattice distortions in the paramagnetic tetragonal phase of superconducting NaFe${}_{1-x}$Ni${}_x$As
• Effect of nematic order on the low-energy spin fluctuations in detwinned BaFe${}_{1.935}$Ni${}_{0.065}$As${}_2$
• Robust short-range-ordered nematicity in FeSe evidenced by high-pressure NMR
• Interplay of lattice, electronic and spin degrees of freedom in detwinned BaFe${}_2$As${}_2$: a Raman scattering study
• Hidden antiferro-nematic order in Fe-based superconductor BaFe${}_2$As${}_2$ and NaFeAs above $T_S$
• In-plane uniaxial pressure-induced out-of-plane antiferromagnetic moment and critical fluctuations in BaFe${}_2$As${}_2$
• Nematic magnetoelastic effect contrasted between Ba(Fe${}_{1-x}$Co${}_x$)${}_2$As${}_2$ and FeSe
• Stress-induced nematicity in EuFe2As2 studied by phononic Raman spectroscopy
• Spin excitation anisotropy in the paramagnetic tetragonal phase of BaFe2 As2
• Anomalous magneto-elastic coupling in Au-doped BaFe2As2
• Raman scattering study of tetragonal magnetic phase in Sr${}_{1-x}$Na${}_x$Fe${}_2$As${}_2$: structural symmetry and electronic gap
• Electronic origin of structural transition in 122 Fe based superconductors
• Direct observation of spin excitation anisotropy in the paramagnetic orthorhombic state of BaFe${}_{2-x}$Ni${}_x$As${}_2$
• Disorder-Induced Electronic Nematicity
• Nematic fluctuations in the non-superconducting iron pnictide BaFe${}_{1.9-x}$Ni${}_{0.1}$Cr${}_x$As${}_2$
• In-plane anisotropic response to the uniaxial pressure in the hidden order state of URu${}_2$Si${}_2$
• Tracking the nematicity in cuprate superconductors: a resistivity study under uniaxial pressure
• Combined resistivity and Hall effect study on NaFe${}_{1-x}$Rh${}_x$As single crystals
• Diverse Exotic Orders and Fermiology in Fe-based Superconductors: A Unified Mechanism for $B_{1g}/B_{2g}$ Nematicity in FeSe/(Cs,Rb)Fe${}_2$As${}_2$ and Smectic Order in BaFe${}_2$As${}_2$
• Strain-activated structural anisotropy in BaFe2As2
• Electronic Phase Propagation Speed in BaFe${}_2$As${}_2$ Revealed by Dilatometry
• Elasto-Raman scattering: arsenic optical phonon as a probe of nematicity in BaFe${}_2$As${}_2$