[QE-users] [SPAM] How to deal with a mode of phonon spectrum that cannot converge

[zhouchao]

How to deal with a mode of phonon spectrum that cannot converge, how to make it converge, tried many methods, but can not be solved。
how to explain this problem, what is the reason, is it a problem of the structure itself, how to analyze it?
As shown in the end of the attachment, the first 10 modes all converge, but the 11th mode fails to converge.
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