<div dir="ltr"><span id="gmail-yui_3_14_1_1_1519728677249_1139"><span class="gmail-collabsible-text" id="gmail-yui_3_14_1_1_1519728677249_1138"><span class="gmail-Linkify" id="gmail-yui_3_14_1_1_1519728677249_1137"><div class="gmail-nova-e-text gmail-nova-e-text--size-m gmail-nova-e-text--family-sans-serif gmail-nova-e-text--spacing-s gmail-nova-e-text--color-inherit gmail-redraft-text">Dear Wien2k, the electron-phonon coupling can be calculated by using the formula<br><br></div><div class="gmail-nova-e-text gmail-nova-e-text--size-m gmail-nova-e-text--family-sans-serif gmail-nova-e-text--spacing-s gmail-nova-e-text--color-inherit gmail-redraft-text"><b>Lambda=(Eta)/(m<w^2>)</b>, Here Eta is Hopefield parameter and can be written as<br><br></div><div class="gmail-nova-e-text gmail-nova-e-text--size-m gmail-nova-e-text--family-sans-serif gmail-nova-e-text--spacing-s gmail-nova-e-text--color-inherit gmail-redraft-text" id="gmail-yui_3_14_1_1_1519728677249_1136"></div><div class="gmail-nova-e-text gmail-nova-e-text--size-m gmail-nova-e-text--family-sans-serif gmail-nova-e-text--spacing-s gmail-nova-e-text--color-inherit gmail-redraft-text"><b>Eta=
N(Ef)*<I^2></b>, Here N(Ef) is total density of states and
<I^2> is the square of electron-phonon matrix element over fermi
surface.<br><br></div><div class="gmail-nova-e-text gmail-nova-e-text--size-m gmail-nova-e-text--family-sans-serif gmail-nova-e-text--spacing-s gmail-nova-e-text--color-inherit gmail-redraft-text">By
using some approximations <w^2> can be written as 0.5*(Theta
D^2), here Theta D is Debye temperature. And m is average atomic mass</div><div class="gmail-nova-e-text gmail-nova-e-text--size-m gmail-nova-e-text--family-sans-serif gmail-nova-e-text--spacing-s gmail-nova-e-text--color-inherit gmail-redraft-text">So the final formula will become as<br><br></div><div class="gmail-nova-e-text gmail-nova-e-text--size-m gmail-nova-e-text--family-sans-serif gmail-nova-e-text--spacing-s gmail-nova-e-text--color-inherit gmail-redraft-text"><b>Lambda=(N(Ef)*<I^2>)/(m*0.5*Theta D^2).</b><br><br></div><div class="gmail-nova-e-text gmail-nova-e-text--size-m gmail-nova-e-text--family-sans-serif gmail-nova-e-text--spacing-s gmail-nova-e-text--color-inherit gmail-redraft-text">Here i am facing the problem how to approximate the <I^2> value from wien2K band structure calculations.<br><br></div><div class="gmail-nova-e-text gmail-nova-e-text--size-m gmail-nova-e-text--family-sans-serif gmail-nova-e-text--spacing-s gmail-nova-e-text--color-inherit gmail-redraft-text">Please suggest a solution.</div></span></span></span><br clear="all"><br>-- <br><div class="gmail_signature" data-smartmail="gmail_signature"><div dir="ltr"><div><div dir="ltr"><div><div dir="ltr"><div><div><div><b>P. Rambabu</b><br></div>PhD Scholor<br></div><div>Physics, IIT Hyderabad<br></div></div>Mobile: 9074508220.<br></div></div></div></div></div></div>
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