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