<P>Dear all:</P>
<P>I'm calculating phonon properties of a hypothetical material, containing<BR>lithium. In the espresso_pp package, there are many pseudopotentials of<BR>lithium, but many of them with wrong results for force and phonon calculation.<BR>For example, in Li.pbe-s-van_ak.info, one can find the following sentences.<BR>"BEWARE: Matteo Calandra reported seriously wrong results with this potential<BR>(notably in forces and phonon frequencies)"</P>
<P>I have tested phonon properities of these pseudopotentials for bcc-lithium.<BR>For Li.pbe-n-van.UPF, Li.pbe-s-van_ak.UPF, Li.pw91-n-van.UPF, Li.pw91-s-van_ak.UPF,<BR>and Li.pz-s-van_ak.UPF, all of them have phonon problems. For Li.pbe-s-mt.UPF,<BR>Li.pz-s-mt.UPF, they gives wrong lattice constants of bcc-lithium.</P>
<P>I know that one can generate pesudopotentials by himself, but it's a very<BR>challenging task to get a robust pesudopotential. Could anyone share a stable<BR>pseudopotential of lithium, which have correct result of phonon?</P>
<P>I am greatly indebted to you for your help. Thanks again!</P>
<P>Best wishes</P>
<P>Miao Gao<BR>------------------<BR>Ph.D. student of Department of Physics, <BR>Renmin University of China.<BR>------------------<BR><BR></P><SPAN></SPAN><br><br>