LiBC by polarized Raman spectroscopy: Evidence for lower crystal symmetry ?

J. Hlinka; I. Gregora; J. Pokorny; A. V. Pronin; A. Loidl

doi:10.1103/PhysRevB.67.020504

LiBC by polarized Raman spectroscopy: Evidence for lower crystal symmetry ?

Superconductivity 2012-12-18 v2 Materials Science

Authors: J. Hlinka , I. Gregora , J. Pokorny , A. V. Pronin , A. Loidl

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Abstract

The paper presents polarized Raman scattering study on a few-micron-size crystallite of LiBC with natural faces. The experiment on as grown sample has revealed a four lattice modes with frequencies at 1276 cm^-1, 830 cm^-1, 546 cm^-1 and 170 cm^-1, respectively. The number of observed Raman lines and their selection rules are incompatible with the assumed D6h symmetry. The modes at 1276 cm^-1 and 170 cm^-1 correspond to the expected Raman active modes. In contrast with the superconducting compound MgB2, the B-C bond stretching mode (at 1276 cm^-1) has rather small damping. The two "forbidden" modes (at 830 cm^-1 and 546 cm^-1) disappeared after subsequent thermal treatment.

Keywords

polarized Raman spectroscopy LiBC crystal symmetry lattice modes selection rules

Cite

@article{arxiv.cond-mat/0207683,
  title  = {LiBC by polarized Raman spectroscopy: Evidence for lower crystal symmetry ?},
  author = {J. Hlinka and I. Gregora and J. Pokorny and A. V. Pronin and A. Loidl},
  journal= {arXiv preprint arXiv:cond-mat/0207683},
  year   = {2012}
}

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4 pages, LaTeX, complementary experimental result

LiBC by polarized Raman spectroscopy: Evidence for lower crystal symmetry ?

Abstract

Keywords

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