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

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

2002-07-29

arxiv.org/abs/cond-mat/0207683v2

Phys. Rev. B, 67 (2003) 020504

Physics

Condensed Matter

Superconductivity

4 pages, LaTeX, complementary experimental result

Scientific paper

10.1103/PhysRevB.67.020504

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.

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