Dear QE users and experts,

I am using CPMD in Quantum Espresso to equilibrium a system with an external 
pressure of 2 GPa. I used variable-cell molecular dynamic (calculation ='vc-cp' 
and press = 20), the high of the cell 'z' was allowed to change to maintain the 
pressure. The target is to reproduce some of the calculation in the following 
paper: https://pubs.acs.org/doi/abs/10.1021/jp206135k

I found that two type of pressure are printed in the output file, Pressure of 
Nuclei and Pressure Total. The pressure of nuclei is relatively close to the 
external pressure while the total one is fluctuate a lot.

What is the meaning and difference between them ?.

Best regards
Nam Tran


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