Lokalisierte Schwingungszustände in kubischen Kristallen mit Punktdefekten
Lokalisierte Schwingungszustände in kubischen Kristallen mit Punktdefekten
The localized modes of vibration are discussed for a face centered and a body centered cubic lattice, if the ideal crystal is perturbated by a substitutional impurity. The eigenvectors are found by group-theoretical considerations, the frequencies can be calculated approximately by a variational pri...
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Personal Name(s): | Dettmann, K. |
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Ludwig, W. | |
Contributing Institute: |
Publikationen vor 2000; PRE-2000; Retrocat |
Imprint: |
Jülich
Kernforschungsanlage Jülich, Verlag
1964
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Physical Description: |
p. 241-61 |
Document Type: |
Report Book |
Research Program: |
Addenda |
Series Title: |
Berichte der Kernforschungsanlage Jülich
178 |
Link: |
OpenAccess OpenAccess |
Publikationsportal JuSER |
The localized modes of vibration are discussed for a face centered and a body centered cubic lattice, if the ideal crystal is perturbated by a substitutional impurity. The eigenvectors are found by group-theoretical considerations, the frequencies can be calculated approximately by a variational principle, which gives good results, if the mode is strongly localized. lt is discussed, which changes in mass and coupling parameters can give rise to localized modes of vibration. lt turns out that in the model, which is considered here (nearest neighbour interaction and no changes in lattice structure), a vacancy does not show localized vibrations. |