[Pw_forum] could pwscf do a Geometry Optimization calculation in LDA+U Scheme

[duchl06]

dear pw users
could any one tell me which method is right?
  1)relax in GGA scheme, then use the  Geometry do a GGA+U scf calculation
or
  2) relax in GGA+U scheme, got the Geometry, then a GGA+U scf calculation
 
I ask this question because i did a Geometry Optimization GGA scheme and  GGA+U (other parameters are almost the same), and i got a very pwdifferent Geometry with the two method, why does this happen?
 
best regards!
 
Du
xiaguanying university
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