Dear Experts, Recently, I have done some phonon calculations about NaFeAs, I noted that some negative frequencies appears at Gamma point. I have also done calculationphonon dispersion for LiFeAs, and again I found some negative frequencies. My input files are attached with mail. Thanking in anticipation for answering my question. Regards, Ziming Fang.
lifeas.ph.out
Description: Binary data
lifeas.scf.in
Description: Binary data
nafeas.phG.in
Description: Binary data
nafeas.phG.out
Description: Binary data
nafeas.scf.in
Description: Binary data
lifeas.freq.gp
Description: Binary data
lifeas.ph.in
Description: Binary data
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