<div dir="ltr">Dear all,<div><br></div><div>I am using Berry phase tutorial to calculate the polarization of PbTiO3. I have followed the BaTiO3 tutorial. I have two structures, one is tetragonal (non-centrosymmetric) and the second one is cubic (centrosymmetric). I have calculated the (spontaneous) polarization as 1.189769e-01 C/m2 (as the cubic system doesn't posses any polarization) which is very low as the reported values are around 80 to 100 µC/cm2. Please help me.</div><div><br></div><div>Regards</div><div>Lokanath<br clear="all"><div><br></div>-- <br><div class="gmail_signature"><div dir="ltr"><span style="color:rgb(136,136,136)">Lokanath Patra</span><div style="color:rgb(136,136,136)">Ph.D Scholar</div><div style="color:rgb(136,136,136)">Dept. of Physics</div><div style="color:rgb(136,136,136)">School of Applied and Basic Sciences</div><div style="color:rgb(136,136,136)">Central University of Tamil Nadu</div><div style="color:rgb(136,136,136)">Thiruvarur</div><div style="color:rgb(136,136,136)">Tamil Nadu - 610004</div><div style="color:rgb(136,136,136)">Ph no - +91-8675834507</div></div></div>
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