Improved SC-ETRS
Description
The original difference of potential could fail for post-LDA calculations in the region of low density. To avoid this, the convergence check is replaced by the first moment of the potential difference.
News snippet
Improve the convergence check of the self-consistent ETRS propagator.
Checklist
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I have checked that my code follows the Octopus coding standards -
I have added tests for all the new features added in this request.