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We use inelastic light scattering to study Sr$_{1-x}$Na$_x$Fe$_2$As$_2$($x\approx0.34$), which exhibits a robust tetragonal magnetic phase thatrestores the four-fold rotation symmetry inside the orthorhombic magneticphase. With cooling, we observe splitting and recombination of an $E_g$ phononpeak upon entering the orthorhombic and tetragonal magnetic phases,respectively, consistent with the reentrant phase behavior. Our electronicRaman data reveal a pronounced feature that is clearly associated with thetetragonal magnetic phase, suggesting the opening of an electronic gap. Nophonon back-folding behavior can be detected above the noise level, whichimplies that any lattice translation symmetry breaking in the tetragonalmagnetic phase must be very weak.

Raman scattering study of tetragonal magnetic phase in Sr$_{1-x}$Na$_x$Fe$_2$As$_2$: structural symmetry and electronic gap