<div dir="ltr"><div style="font-family:arial,sans-serif;font-size:13px">Dear Espresso users<br></div><span style="font-family:arial,sans-serif;font-size:13px">I have performed a phonon calculation of an oxides on 4*4*2 q grid. </span><div style="font-family:arial,sans-serif;font-size:13px">
 I am using pw.<span class="" style="background:rgb(255,255,204)">x</span> , ph.<span class="" style="background:rgb(255,255,204)">x</span>; q2r.<span class="" style="background:rgb(255,255,204)">x</span>, matdyn.<span class="" style="background:rgb(255,255,204)">x</span> and <span class="" style="background:rgb(255,255,204)">lambda</span>.<span class="" style="background:rgb(255,255,204)">x</span>  to calculate the </div>
<div style="font-family:arial,sans-serif;font-size:13px"> phonon-electron coupling  </div><div style="font-family:arial,sans-serif;font-size:13px">i obtained  the positive frequencies, but i get the following message during the lambda.x commnde</div>
<div style="font-family:arial,sans-serif;font-size:13px">forrtl: No such file or directory</div><div style="font-family:arial,sans-serif;font-size:13px">forrtl : severe (29): file not found, unit 4, file/home/halima/MgB2/.../fort.4</div>
<div style="font-family:arial,sans-serif;font-size:13px">lambda.x 00000000000000049      Unknown  </div><div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">
<br></div><div style="font-family:arial,sans-serif;font-size:13px"><br></div><div style="font-family:arial,sans-serif;font-size:13px">libc.so.6                  unknown</div><div style="font-family:arial,sans-serif;font-size:13px">
any suggestions to solve this problem </div><div style="font-family:arial,sans-serif;font-size:13px">cordially</div><div style="font-family:arial,sans-serif;font-size:13px">i can't explain why i get negatives frequencies</div>
<div style="font-family:arial,sans-serif;font-size:13px">Kindly suggest me the possible ways where I can solve this.</div><div style="font-family:arial,sans-serif;font-size:13px"><font face="arial, sans-serif">cordially<span class=""><font color="#888888"><br clear="all">
</font></span></font><div class=""><div id=":3p8" class="" tabindex="0"><img class="" src="https://mail.google.com/mail/u/0/images/cleardot.gif"></div></div></div><div><br></div>-- <br><div dir="ltr"><font color="#888888"><font color="#ff0000" face="georgia, serif">H.ZAARI</font><div>
<font face="georgia, serif">PhD Student in </font><span style="font-family:georgia,serif">laboratory of magnetism and physics of high energy</span></div>
<div><font face="georgia, serif">Faculty of Sciences in Rabat - Morocco</font></div>
<div><font face="georgia, serif">Email:<u> halimazaari<font color="#3366ff"><a href="mailto:boujnah.mourad@gmail.com" target="_blank">@gmail.com</a><br></font></u></font><br></div></font></div>
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