<html><head><style type="text/css"><!-- DIV {margin:0px;} --></style></head><body><div style="font-family:times new roman,new york,times,serif;font-size:12pt">Dear Paul,<br><br>In fact, I am working on this problem in order to support in PlotPhon almost all lattice types. I will let you know soon, hopefully.<br><div> <br>Best regards,<br>Eyvaz.<br></div>-------------------------------------------------------------------<br>Prof. Eyvaz Isaev, <br>Department of Physics, Chemistry, and Biology (IFM), Linkoping University, Sweden <br>Theoretical Physics Department, Moscow State Institute of Steel & Alloys, Russia, <br>isaev@ifm.liu.se, eyvaz_isaev@yahoo.com<div><br></div><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><br><div style="font-family: times new roman,new york,times,serif; font-size: 12pt;"><font face="Tahoma" size="2"><hr size="1"><b><span style="font-weight: bold;">From:</span></b> W2AGZ
<w2agz@w2agz.com><br><b><span style="font-weight: bold;">To:</span></b> pw_forum@pwscf.org<br><b><span style="font-weight: bold;">Sent:</span></b> Fri, February 18, 2011 10:06:08 AM<br><b><span style="font-weight: bold;">Subject:</span></b> [Pw_forum] ibrav=12<br></font><br>
<style><!--
_filtered {font-family:Calibri;panose-1:2 15 5 2 2 2 4 3 2 4;}
p.MsoNormal, li.MsoNormal, div.MsoNormal
{margin:0in;margin-bottom:.0001pt;font-size:11.0pt;font-family:"sans-serif";}
a:link, span.MsoHyperlink
{color:blue;text-decoration:underline;}
a:visited, span.MsoHyperlinkFollowed
{color:purple;text-decoration:underline;}
span.EmailStyle17
{font-family:"sans-serif";color:windowtext;}
.MsoChpDefault
{font-family:"sans-serif";}
_filtered {margin:1.0in 1.0in 1.0in 1.0in;}
div.WordSection1
{}
--></style><div class="WordSection1"><p class="MsoNormal">To All (especially Eyvaz):</p><p class="MsoNormal"> </p><p class="MsoNormal">I would like to create a file for PlotPhon/Include to support general monoclinic structures. Below is the Include file for orthorhombic as an example “kick off:”</p><p class="MsoNormal"> </p><p class="MsoNormal"># Simple Orthorhombic lattice (X=b/a, Y=c/a)</p><p class="MsoNormal"> 1.0 0.0 0</p><p class="MsoNormal"> 0.0 XX 0</p><p class="MsoNormal"> 0.0 0.0 YY</p><p class="MsoNormal"># With respect to basis vectors</p><p class="MsoNormal">1 0.00000 0.00000 0.50000 Z</p><p class="MsoNormal">50 0.00000 0.00000 0.00000 G</p><p class="MsoNormal">50 0.500000
0.00000 0.00000 X</p><p class="MsoNormal">50 0.500000 0.50000 0.00000 S</p><p class="MsoNormal">50 0.000000 0.50000 0.00000 Y</p><p class="MsoNormal">50 0.000000 0.00000 0.00000 G</p><p class="MsoNormal">50 0.500000 0.50000 0.50000 R</p><p class="MsoNormal"> </p><p class="MsoNormal">Now, the “popular” cell convention for monoclinic structures is either “b-axis-unique,” or “c-axis-unique.” PWgui and PWscf prefer the latter, but that’s OK, since it’s a simple transformation, as least in direct space, between the two. But, what is the appropiate “include” for ibrav=12 “c-axis unique?” I’ve been to “BILBOA,” and the Bouchaert-Smoluchowski-Wigner path I want is gamma-a-u-e-z-lambda-gamma for both electrons and phonons.
Incidentally, when I was a graduate student, the legend was that the BSW notation was invented by physicists to purposely confuse chemists. So, please tell me how to construct the appropriate “scripts/lines” and “include” files accordingly.</p><p class="MsoNormal"> </p><p class="MsoNormal">Grazi, Paul Grant</p><p class="MsoNormal">IBM Research Staff Member Emeritus</p><p class="MsoNormal"><a rel="nofollow" target="_blank" href="http://www.w2agz.com">www.w2agz.com</a></p><div style="border-width: medium medium 3pt; border-style: none none dotted; border-color: -moz-use-text-color -moz-use-text-color windowtext; padding: 0in 0in 1pt;"><p class="MsoNormal" style="border: medium none; padding: 0in;"> </p></div><p class="MsoNormal">Addenda...I include the following at the risk of angering Santo Paolo who may excommunicate me from the forum on the basis of “topic out of bounds.” “Mea culpa...dominus noster...” Therefore
I apologize for this posting and to those for whom English is not their native language, especially Americans, Australians, Kiwis, Irish, Scots, Welsh, Cornish, Indians and particularly Quebecois (British Columbians excepted).</p><p class="MsoNormal"> </p><p class="MsoNormal">2011 is the 100<sup>th</sup> anniversary of the discovery of superconductivity and the 25<sup>th</sup> of above liquid nitrogen in copper oxide perovskites. I will be giving one of the plenary talks at the upcoming APS March Meeting in Dallas...go <a rel="nofollow" target="_blank" href="http://meetings.aps.org/Meeting/MAR11/APS_epitome">here</a> for the epitome. And later a reprise at the MRS April Meeting in San Francisco. But, in addition, I will also present a contributed talk at each meeting on “proxy” CuO structures based entirely on Quantum Espresso resources...go <a rel="nofollow" target="_blank"
href="http://meetings.aps.org/Meeting/MAR11/Event/139995">here</a> to see.</p><p class="MsoNormal"> </p><p class="MsoNormal">I would love to see and meet members of the QE community at each event...and offer a “real espresso” beverage. Look for me outside any of the superconductivity sessions, or inquire in the press room. I’m reasonably identifiable...an old guy with long white hair and beard. Hmm...well...maybe not that unique!</p><p class="MsoNormal"> </p></div></div></div>
</div><br>
</body></html>