Comparative Raman study of Weyl semimetals TaAs, NbAs, TaP and NbP

H. W. Liu; P. Richard; L. X. Zhao; G. -F. Chen; H. Ding

doi:10.1088/0953-8984/28/29/295401

Comparative Raman study of Weyl semimetals TaAs, NbAs, TaP and NbP

Materials Science 2016-06-03 v2

Authors: H. W. Liu , P. Richard , L. X. Zhao , G. -F. Chen , H. Ding

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Abstract

We report a comparative polarized Raman study of Weyl semimetals TaAs, NbAs, TaP and NbP. The evolution of the phonon frequencies with the sample composition allows us to determine experimentally which atoms are mainly involved for each vibration mode. Our results confirm previous first-principles calculations indicating that the A $_1$ , B $_1(2)$ , E $(2)$ and E $(3)$ modes involve mainly the As(P) atoms, the B $_1(1)$ mode is mainly related to Ta(Nb) atoms, and the E $(1)$ mode involves both kinds of atoms. By comparing the energy of the different modes, we establish that the B $_1(1)$ , B $_1(2)$ , E $(2)$ and E $(3)$ become harder with chemical pressure increasing. This behavior differs from our observation on the A $_1$ mode, which decreases in energy, in contrast to its behavior under external pressure.

Keywords

Weyl semimetals Raman study phonon frequencies vibration modes first-principles calculations chemical pressure

Cite

@article{arxiv.1603.05741,
  title  = {Comparative Raman study of Weyl semimetals TaAs, NbAs, TaP and NbP},
  author = {H. W. Liu and P. Richard and L. X. Zhao and G. -F. Chen and H. Ding},
  journal= {arXiv preprint arXiv:1603.05741},
  year   = {2016}
}

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4 pages, 3 figures, 1 table. 1 new figure added

Comparative Raman study of Weyl semimetals TaAs, NbAs, TaP and NbP

Abstract

Keywords

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