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Phonon mode

  1. Jul 21, 2010 #1
    Hello all,

    what is meant by soft optical modes. Is it just the Einstein modes with low frequency ?

  2. jcsd
  3. Jul 21, 2010 #2


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    Staff Emeritus
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    Gold Member

    Yes. Usually, the lowest wave-vector mode is called the soft mode.
  4. Jul 24, 2010 #3
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