I have calculated the dielectric tensor using ph.x for the case of PAW pseudopotential with spin-orbit interaction (non-magnetic) and obtained the results.<div><br></div><div>After calculation, I have found the comments in the header of phonon.f90 file as follows:</div>
<div><br></div><div>  ! ... Presently implemented:                                                                                                                                                       </div><div>...                                                                                                                          </div>
<div>  ! ... dielectric constant       NC [5], US [5], PAW [3]                                                                                                                            </div><div>  ! ... born effective charges    NC [5], US [5], PAW [3]                                                                                                                            </div>
<div>...                                                                                                                                     </div><div>  !                                                                                                                                                                                  </div>
<div>  ! NC = norm conserving pseudopotentials                                                                                                                                            </div><div>  ! US = ultrasoft pseudopotentials                                                                                                                                                  </div>
<div>  ! PAW = projector augmented-wave                                                                                                                                                   </div><div>  ! [1] LDA,                                                                                                                                                                         </div>
<div>  ! [2] [1] + GGA,                                                                                                                                                                   </div><div>  ! [3] [2] + LSDA/sGGA,                                                                                                                                                             </div>
<div>  ! [4] [3] + Spin-orbit/nonmagnetic,                                                                                                                                                </div><div>  ! [5] [4] + Spin-orbit/magnetic (experimental when available)       </div>
<div><br></div><div>Do they mean that my results for dielectric tensor and born effective charges are not meaningful?</div>