[Pw_forum] Particular Phonon mode

Bipul Rakshit bipulrr at gmail.com
Tue Nov 3 05:43:11 CET 2009

Dear PWscf users,
I am doing gamma Phonon calculation on LaMnO3. Since the unit cell contain
20 atoms, so at gamma i am getting 60 frequencies (3 acoustic modes ~ 0)

If I am just interested in just the first three frequencies ( the acoustic
modes), what changes i have to made in the input file.

phonons of LaMnO3-pero
  alpha_mix(1)= 0.7,
!  epsil=.true.,
!  ldisp=.true.,
!  nq1=2, nq2=2, nq3=2
!  iq1=6, iq2=6, iq3=6
!   lnscf= .true.
  amass(1)= 138.9055,
  outdir = './OUT',
 0.0 0.0 0.0

Dr. Bipul Rakshit
Research Associate,
S N Bose Centre for Basic Sciences,
Salt Lake,
Kolkata 700 098
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