I have a plot of phonon dispersion curves for rhombohedral compound. What is intriguing me is that the plot shows the same direction (Gam->X) twice and dispersion curves are slightly different in both cases.
I was told that the points in BZ are given correctly, and that this kind of thing can happen in rhombohedral lattice.
Can someone provide me with some explanation?
I think there is a wrong letter there. Where is K point? Can it be the left X?
I think there is a wrong letter there. Where is K point? Can it be the left X?
You are right, every point from the table is on the plot except for K... Later I compared phonon energies at both X points, and they are exactly the same for every branch.
So this only gives me another question, if indeed labelling is wrong, then how come that phonons with wavevector K and X have exactly the same energies for 30 different branches?
Another possibility is that the K line between the left X and Gamma is not shown. So, one of them is going to X by K.
Another possibility is that the K line between the left X and Gamma is not shown. So, one of them is going to X by K.
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