Pressure-induced phonon frequency shifts in transition-metal nitrides

Xiao-Jia Chen; Viktor V. Struzhkin; Simon Kung; Ho-kwang Mao; Russell J. Hemley; Axel N. Christensen

doi:10.1103/PhysRevB.70.014501

Pressure-induced phonon frequency shifts in transition-metal nitrides

Superconductivity 2009-11-10 v1 Materials Science

Authors: Xiao-Jia Chen , Viktor V. Struzhkin , Simon Kung , Ho-kwang Mao , Russell J. Hemley , Axel N. Christensen

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Abstract

We report the first experiments on the high pressure phonon spectra of transition-metal nitrides HfN, ZrN, and NbN, obtained by Raman scattering measurements. Two pronounced bands, which are related to the acoustic part at low frequency around 200 cm $^{-1}$ and the optical part at high frequency around 550 cm $^{-1}$ of the phonon spectrum, respectively, shift to high frequency values with increasing pressure. An analysis of the results allows us to reproduce the experimental pressure dependence of the superconducting transition temperature $T_{c}$ of ZrN and NbN.

Keywords

phonon spectra Raman scattering superconducting transition temperature high pressure transition-metal nitrides

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@article{arxiv.cond-mat/0401163,
  title  = {Pressure-induced phonon frequency shifts in transition-metal nitrides},
  author = {Xiao-Jia Chen and Viktor V. Struzhkin and Simon Kung and Ho-kwang Mao and Russell J. Hemley and Axel N. Christensen},
  journal= {arXiv preprint arXiv:cond-mat/0401163},
  year   = {2009}
}

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19 pages and 6 figures

Pressure-induced phonon frequency shifts in transition-metal nitrides

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