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I have been unable to figure out what the Kohn anomaly is. What exactly is it, and why is it important?

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    $\begingroup$ Related: mattermodeling.stackexchange.com/q/366/5. Also I agree with Cody, if you can tell us what you have looked at so far, that would make your answer more upvoted. $\endgroup$ Jul 15 '20 at 21:49
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    $\begingroup$ The upvote button says "This question shows research effort...", probably need to do that. $\endgroup$
    – Cody Aldaz
    Jul 15 '20 at 21:49