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LiBC by polarized Raman spectroscopy: Evidence for lower crystal symmetry ? | | J. Hlinka
; I. Gregora
; J. Pokorny
; A.V. Pronin
; A. Loidl
; | | Date: |
29 Jul 2002 | | Journal: | Phys. Rev. B, 67 (2003) 020504 | | Subject: | Superconductivity; Materials Science | cond-mat.supr-con cond-mat.mtrl-sci | | 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. | | Source: | arXiv, cond-mat/0207683 | | Services: | Forum | Review | PDF | Favorites | |
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