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Calculate LO-TO splitting: When checked, indicates that a non-analytical correction to the dynamical matrix will be applied. The LO-TO phonon frequency splitting at the ¦£-point will be calculated along the directions connecting the ¦£-point with the neighboring points along the reciprocal space path. Default = checked.
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http://phonopy.sourceforge.net/input-files.html?highlight=born%20effective%20charge
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