New phase transition in Na2Ti2As2O revealed by Raman scattering
Abstract
We performed a Raman scattering study of Na2Ti2As2O. We identified a symmetry breaking structural transition at around Ts = 150 K, which matches a large bump in the electrical resistivity. Several new peaks are detected below that transition. Combined with first-principles calculations, our polarization-dependent measurements suggest a charge instability driven lattice distortion along one of the Ti-O bonds that breaks the 4-fold symmetry and more than doubles the unit cell.
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