Basis of two unlike atoms for the problem treated by (18) to (26), find the amplitude ratios
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Basis of two unlike atoms for the problem treated by (18) to (26), find the amplitude ratios u/v for the two branches at K max = π/a. Show that at this value of K the two lattices act as if decoupled: one lattice remains at rest while the other lattice moves.
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From Eq 20 evaluated at K na the zone boundary we ...View the full answer
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