Thank you!
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Insert Eq.61 into Eq.59. You will get Eq.62, plus a higher-order term.
Paolo
On Fri, Feb 19, 2021 at 12:52 AM Andrew Xu wrote:
> Hi users,
>
> I had a question about one of the DFPT equations in Baroni et al. "Phonons
> and related crystal properties from DFPT." I was unsure about posting this
Hi users,
I had a question about one of the DFPT equations in Baroni et al. "Phonons
and related crystal properties from DFPT." I was unsure about posting this
question here because most of the questions here are about using QE, but I
choose to do so since DFPT is implemented in QE, the authors ar
