Three impurity cluster in a diatomic linear chain |
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Authors: | P Nayak S N Behera |
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Institution: | 1. Institute of Physics, A/105 Saheed Nagar, 751 007, Bhubaneswar
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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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