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

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

doi:10.1103/PhysRevB.93.140501

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

Superconductivity 2016-04-13 v1 Strongly Correlated Electrons

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

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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.

Keywords

Raman scattering Na2Ti2As2O structural phase transition symmetry breaking charge instability lattice distortion first-principles calculations

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@article{arxiv.1601.01777,
  title  = {New phase transition in Na$_{2}$Ti$_{2}$As$_{2}$O revealed by Raman scattering},
  author = {D. Chen and T. T. Zhang and Z. -D. Song and H. Li and W. -L. Zhang and T. Qian and J. -L. Luo and Y. -G. Shi and Z. Fang and P. Richard and H. Ding},
  journal= {arXiv preprint arXiv:1601.01777},
  year   = {2016}
}

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5 pages, 3 figures, 1 table

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

Abstract

Keywords

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