View source for Be careful with the default smearing method (ISMEAR=1)

The default for {{TAG|ISMEAR}} is 1 in VASP. This setting is not appropriate for 
insulators and semiconductors, and can results in one-electron occupancies that
are larger than 1 (2 for non spinpolarized) systems, and conversely
some states being occupied by less than 1 electron close to the Fermi-level.
It is strongly recommended to set {{TAG|ISMEAR}}=0 in the INCAR file
and use a small width {{TAG|SIGMA}}=0.05 (do not make SIGMA too small,
values below 0.001 can also lead to undesirable symmetry breaking).

Read more on this in {{TAG|Number of k points and method for smearing}}!


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[[Category:Common Pitfalls]]