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What is practical importance of Kohn anomaly for experimentalists and/or theorists?

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    $\begingroup$ Please specify the question. otherwise wiki $\endgroup$ – IljaBek Aug 16 '11 at 6:03
  • $\begingroup$ Sorry, I can't see what's wrong with this? It's very specific and I believe person with experience should describe it in a few words. Besides, I can't find answer on wiki, nor elsewhere. If someone could point out where on wiki answer is, i would be grateful and apologize for recklessness. $\endgroup$ – multipole Aug 16 '11 at 14:38
  • $\begingroup$ "practical importance" is always debatable. I would not know where to start. Did you try to google Kohn effect OR anomaly +application? there is no theoretical explanation/basis for the effect as far as I could understand from here (downvote itn't mine) $\endgroup$ – IljaBek Aug 16 '11 at 15:06
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    $\begingroup$ Downvote is mine -- this question is too vague. If you understand at least something about Kohn anomaly, then ask a precise question. If you don't then first go learn about it somewhere or ask a question that makes it obvious that you don't know what it is. $\endgroup$ – Marek Aug 16 '11 at 15:31
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The practical importance of a Kohn anomaly is that it is a direct evidence of electron phonon coupling in a metallic system. This is used as evidence for electron-phonon coupling in BCS superconductors for example. Further, a Kohn anomaly is a sharp change in a lattice vibration that can cause a lattice instabilities, which can result in structural phase transitions of a material in extreme cases.

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