<div>Dear Zhao</div><div>The most efficient way is reducing the mixing_beta, you may try 0.1 -0.01 or even smaller if you can afford the CPU time. Is 50 enough for O? You may check it, the smallest value usually is given in the PP file. A personal experience is that do not use semi-core PP. I do not understand the reason but I seldom get convergence when using semi-core PPs in periodical cases with PWSCF.</div><sign signid="99"><div> </div><div>Good luck</div><div><div style="color: rgb(144, 144, 144); font-family: Arial Narrow; font-size: 12px;"><br><br><br><br>------------------</div><div style="color: rgb(0, 0, 0); font-family: Verdana; font-size: 14px;"><div><div class="logo" style="margin: 20px 0px 0px; width: 305px; height: 35px; line-height: 35px;"><img src="https://exmail.qq.com/cgi-bin/viewfile?type=logo&domain=sustc.edu.cn"></div><div class="c_detail" style="margin: 10px 0px 0px;"><h4 class="name" style="margin: 0px; line-height: 28px; font-size: 14px; font-weight: bold; -ms-zoom: 1;">庞瑞(PANG Rui)</h4><p class="position" style="margin: 0px; color: rgb(160, 160, 160); line-height: 22px;"></p><p class="department" style="margin: 0px; color: rgb(160, 160, 160); line-height: 22px;">South University of Science and Technology of China/Department of Physics</p><p class="department" style="margin: 0px; color: rgb(160, 160, 160); line-height: 22px;">No.1088,Xueyuan Road, Shenzhen,Guangdong<br></p><p class="phone" style="margin: 0px; color: rgb(160, 160, 160); line-height: 22px;"></p></div></div></div></div></sign><div></div><div> </div><div><includetail><div> </div><div> </div><div style="color: rgb(0, 0, 0);"><div style="padding: 2px 0px; font-family: Arial Narrow; font-size: 12px;">------------------ Original ------------------</div><div style="background: rgb(239, 239, 239); padding: 8px; font-size: 12px;"><div id="menu_sender"><b>From: </b> "Shuai"<zhao-shuai@edu.life.kyutech.ac.jp>;</div><div><b>Date: </b> Fri, Oct 9, 2015 12:00 PM</div><div><b>To: </b> "PWSCF Forum"<pw_forum@pwscf.org>; <wbr></div><div></div><div><b>Subject: </b> [Pw_forum] Convergence NOT achieved for Sr2MnMoO6 using PAW pp</div></div><div> </div>Dear User:<br><br>I am doing the SCF calculation of Sr2MnMoO6 using PAW Potentials but it <br>cannot converged.<br><br>I checked different Ecut (30Ry, 40Ry or 50Ry), mixing mode (TF or <br>plain), diagonalization (david or cg) and mixing_beta (0.3, 0.7), but it <br>always not converged.<br><br>The SCF input is:<br><br> &control<br> calculation = 'scf'<br> prefix = 'Sr2MnMoO6'<br> restart_mode = 'from_scratch'<br> pseudo_dir = '/'<br> outdir = '/'<br> /<br> &system<br> ibrav = 1<br> celldm(1) = 15.27295<br> nat = 40<br> ntyp = 4<br> ecutwfc = 50<br> ecutrho = 600<br> occupations = 'smearing'<br> smearing = 'mp'<br> degauss = 0.01<br> lda_plus_u = .true.<br> Hubbard_U(2) = 4.0<br> /<br> &electrons<br> conv_thr = 1e-8<br> mixing_mode = 'TF'<br> mixing_beta = 0.7<br> diagonalization = 'david'<br> /<br>ATOMIC_SPECIES<br> Sr 87.620 Sr.pbe-spn-kjpaw_psl.1.0.0.UPF<br> Mn 54.938 Mn.pbe-spn-kjpaw_psl.1.0.0.UPF<br> Mo 95.960 Mo.pbe-spn-kjpaw_psl.1.0.0.UPF<br> O 15.999 O.pbe-n-kjpaw_psl.1.0.0.UPF<br>ATOMIC_POSITIONS (crystal)<br> Sr 0.0000 0.0000 0.0000<br> Sr 0.5000 0.0000 0.0000<br> Sr 0.0000 0.5000 0.0000<br> Sr 0.5000 0.5000 0.0000<br> Sr 0.0000 0.0000 0.5000<br> Sr 0.5000 0.0000 0.5000<br> Sr 0.0000 0.5000 0.5000<br> Sr 0.5000 0.5000 0.5000<br> Mn 0.2500 0.2500 0.2500<br> Mo 0.7500 0.2500 0.2500<br> Mo 0.2500 0.7500 0.2500<br> Mn 0.7500 0.7500 0.2500<br> Mo 0.2500 0.2500 0.7500<br> Mn 0.7500 0.2500 0.7500<br> Mn 0.2500 0.7500 0.7500<br> Mo 0.7500 0.7500 0.7500<br> O 0.2500 -0.0140 0.2500<br> O -0.0140 0.2500 0.2500<br> O 0.2500 0.2500 -0.0140<br> O 0.7500 0.0140 0.2500<br> O 0.5140 0.2500 0.2500<br> O 0.7500 0.2500 0.0140<br> O 0.2500 0.5140 0.2500<br> O 0.0140 0.7500 0.2500<br> O 0.2500 0.7500 0.0140<br> O 0.7500 0.4860 0.2500<br> O 0.4860 0.7500 0.2500<br> O 0.7500 0.7500 -0.0140<br> O 0.2500 0.0140 0.7500<br> O 0.0140 0.2500 0.7500<br> O 0.2500 0.2500 0.5140<br> O 0.7500 -0.0140 0.7500<br> O 0.4860 0.2500 0.7500<br> O 0.7500 0.2500 0.4860<br> O 0.2500 0.4860 0.7500<br> O -0.0140 0.7500 0.7500<br> O 0.2500 0.7500 0.4860<br> O 0.7500 0.5140 0.7500<br> O 0.5140 0.7500 0.7500<br> O 0.7500 0.7500 0.5140<br>K_POINTS (automatic)<br> 4 4 4 1 1 1<br><br>Thanks in advance for your suggestions.<br><br>Best regards,<br><br>Shuai Zhao<br><br>-- <br>PhD candidate<br>Graduate School of Life Science and Systems Engineering<br>Kyushu Institute of Technology, Japan<br><br>_______________________________________________<br>Pw_forum mailing list<br>Pw_forum@pwscf.org<br>http://pwscf.org/mailman/listinfo/pw_forum</div><!--<![endif]--></includetail></div>