Abstract
The isotopic phonon effects in LaB6 are investigated on the Raman spectra of a series of high-quality single crystals with systematically varied contents of 10B and 11B isotopes. A detailed group theoretical analysis enlightens the correlation between distortions of the B6 octahedra and the splitting or broadening of phonon modes. It is evident that LaB6 does not have cubic symmetry as assumed so far. A further symmetry reduction of the B6 octahedra occurs in isotopically mixed crystals. There, the distribution of isotopes is not random as commonly assumed; the probability of associating equal isotopes increases with their mass decreasing.
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