[Wien] Cobalt- Optimization

[Sherif Yehia]

Dear Wien users

   I am trying to learn how to optimize volume for Co
hcp the input used are the space group p63/mmc lattice
parameter a= 2.5 , c= 4.07 Angstrom.I used the
optimize(v,c/a) option from the interface. My question
are
1- The minimum energy should occurs at V~ 22.2 A^3
which is not  the case for my run  (Please see my
attached optimization  result  for cobalt) 

2-I ran  optimization for Heusler alloys (Co2TiZ) as
published(2005)   in JAP by Prof Blaha and it work
very neat. ( Does it mean that    hcp needs different
approach to locate the minimum energy?).

  I hope I can get some advice to catch my mistakes

  Thank you

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