Abstract
The modes of vibration of a three impurity cluster in a diatomic linear chain is studied. The configuration of the three impurity atoms is such that two of these go into next nearest neighbour sites in one of the sub-lattices whereas the third occupies the central in between site in the other sub-lattice. New local, gap and inband modes are seen to exist, besides the ones corresponding to the impurity pairs. A new feature which appears is that the frequencies of some of the pair modes remain totally unaffected in the presence of the third impurity atom.
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Nayak, P., Behera, S.N. Three impurity cluster in a diatomic linear chain. Pramana - J Phys 10, 621–627 (1978). https://doi.org/10.1007/BF02879550
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DOI: https://doi.org/10.1007/BF02879550