New phase transition in Na$_{2}$Ti$_{2}$As$_{2}$O revealed by Raman scattering

D. Chen; H. Ding; H. Li; J.-L. Luo; P. Richard; T. Qian; T. T. Zhang; W.-L. Zhang; Y.-G. Shi; Z.-D. Song

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New phase transition in Na$_{2}$Ti$_{2}$As$_{2}$O revealed by Raman scattering

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arxiv 1601.01777 v1 pith:UXGFH22V submitted 2016-01-08 cond-mat.supr-con cond-mat.str-el

D. Chen , T. T. Zhang , Z.-D. Song , H. Li , W.-L. Zhang , T. Qian , J.-L. Luo , Y.-G. Shi

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Z. Fang P. Richard H. Ding

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classification cond-mat.supr-concond-mat.str-el

keywords transitionramanscatteringsymmetryalongaroundbelowbonds

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abstract

We performed a Raman scattering study of Na$_2$Ti$_2$As$_2$O. We identified a symmetry breaking structural transition at around $T_s = 150$ 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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