<br clear="all"><div>Dear wien2k users,</div><div><br></div><div> We all know that LSDA (or GGA)+U can be used successfully for a Mott-Hubbard insulator. Anisimov et al. [PRL 99, 156404 (2007)] have described that for a charge transfer insulator we need to use LDA+DMFT for modelling their band structure properly. Now my question is : </div>
<div><br></div><div>(1) Is their any option in wien2k by which we can use LDA+DMFT?</div><div><br></div><div>(2) In our calculation after applying GGA+U (U for d orbital of TM) we saw that although there are a band gap between spin up & spin dn d DOS of transition metal, there are ligand (O p) DOS at Fermi Energy which is making our material metallic while experimentally it is an insulator [conductivity ~ 10^(-7)]. Here should we apply some value of U (say 0.15 Ry) for O p orbital also?</div>
<div><br></div><div>(3) Any other advice regarding to this problem will be highly appreciated.</div><div><br></div><div>Thanks in advance.</div><div><br></div><div>yours faithfully,</div>-- <br>Shamik Chakrabarti<br>Senior Research Fellow<br>
Dept. of Physics & Meteorology<br>Material Processing & Solid State Ionics Lab<br>IIT Kharagpur<br>Kharagpur 721302<br>INDIA<br>