Can we simply understand a softened phonon mode as one having reduced energy/frequency?(adsbygoogle = window.adsbygoogle || []).push({});

Does "soft" indicate smaller value of the spring coefficient like the k in

f=kx,

where f is force and x is displacement of a spring, so a "soft" spring has a smaller k value?

Thanks for all help.

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# About soft phonon mode: is it simply of reduced energy

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