Dear wien users and developers,<br> I am working on some 3d TM oxides. With a normal scf cycle with or without inclusion of U value, I got good convergence in energy and charge. This oxide material is reported to have a bandgap of approx. 0.3 eV. In GGA, I do not observe any gap. In the meantime even with very high value of U, the bandgap do not open up. Because of this, I tried to implement mBj potential (in order to find the bandgap) both with and without inclusion of U, but the energy and charge do not converge.<br>
Rather even for a large number of iteration (199), the energy and charge remains constant without convergence (shown below).<br><br>For GGA without mBj the scf cycle smoothly converges as below:<br>in cycle 22 ETEST: .0000236850000000 CTEST: .0038743<br>
in cycle 23 ETEST: .0000184300000000 CTEST: .0012996<br>in cycle 24 ETEST: .0000174650000000 CTEST: .0006011<br>in cycle 25 ETEST: .0000037600000000 CTEST: .0007451<br>in cycle 26 ETEST: .0000016050000000 CTEST: .0001163<br>
<br>> stop<br><br>while with mBj+GGA, energy and charge convergence remains constant above cycle 103 and could not converge as below: <br>in cycle 193 ETEST: .2112103950000000 CTEST: 2.0591251<br>in cycle 194 ETEST: .2112103950000000 CTEST: 2.0591251<br>
in cycle 195 ETEST: .2112103950000000 CTEST: 2.0591251<br>in cycle 196 ETEST: .2112103950000000 CTEST: 2.0591251<br>in cycle 197 ETEST: .2112103950000000 CTEST: 2.0591251<br>in cycle 198 ETEST: .2112103950000000 CTEST: 2.0591251<br>
in cycle 199 ETEST: .2112103950000000 CTEST: 2.0591251<br><br>> energy in SCF NOT CONVERGED<br><br>Does anyone have experienced this type of problems. If so, please let me know how it can be converged. I followed all the steps as described in previous wien mail and userguid but could not solve. <br>
Your help to solve this issue will be higly appreciated.<br>Thanks in advance<br><br>Madhav Ghimire<br><br>-- <br><div><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">MANA, </span><span style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">National Institute for Materials Science (NIMS)</span><br style="color:rgb(34,34,34);font-family:arial,sans-serif;font-size:13px;background-color:rgb(255,255,255)">
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