[Pw_forum] About phonon dispersion

[Shyam Khambholja]

Dear all,
            I want to compute phonon dispersion curves for nickel. when
running q2r.in file,
            I am getting following message.

           reading grid info from file ni.dyn0
           reading force constants from file ni.dyn1
           Dielectric tensor not found.
           nqs=1
          q = 0.00 0.00 0.00


 please tell me the error in ni.ph.in file.

  Here is the ni.ph.in file
#################################################

&inputph

  tr2_ph=1.0d-14,

  prefix='ni',

  ldisp=.true.,

  nq1=4,

  nq2=4,

  nq3=4,

  amass(1)=58.71,

  outdir='/home/birju/tmp/',

  fildyn='ni.dyn',

 /

###########################################
      Also, when I am running matdyn.x program, I am getting following
message.


     from matdyn : info #        -1
     Z* not found in file ni444.fc, TO-LO splitting at q=0 will be absent!
     A direction for q was not specified:TO-LO splitting will be absent
     from matdyn : info #        -1
     Z* not found in file ni444.fc, TO-LO splitting at q=0 will be absent!
     A direction for q was not specified:TO-LO splitting will be absent


So, please help me.

Thanks in advance.
-- 
Shyam G Khambholja
Reseach student,
Depratment of Physics,
Sardar Patel University
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