howto:dft_u
Differences
This shows you the differences between two versions of the page.
Both sides previous revisionPrevious revisionNext revision | Previous revision | ||
howto:dft_u [2023/11/23 09:14] – Add intro krack | howto:dft_u [2023/11/23 10:23] (current) – Fix typo krack | ||
---|---|---|---|
Line 1: | Line 1: | ||
====== How to run a DFT+U calculation ====== | ====== How to run a DFT+U calculation ====== | ||
- | Plain density functional theory (DFT) based on the local density approximation (LDA) and the generalized | + | Plain density functional theory (DFT) calculations |
===== EOS calculation for cubic FeO using DFT+U ===== | ===== EOS calculation for cubic FeO using DFT+U ===== | ||
- | The following '' | + | The following '' |
<code cp2k> | <code cp2k> | ||
Line 222: | Line 222: | ||
&END FORCE_EVAL | &END FORCE_EVAL | ||
</ | </ | ||
+ | The suggested Hubbard U< | ||
+ | The calculations for different cell sizes, e.g. for 98% of the experimental cell volume, can be accomplished by changing the scaling factor '' | ||
+ | < | ||
+ | @SET a | ||
+ | </ | ||
+ | to | ||
+ | < | ||
+ | @SET a | ||
+ | </ | ||
+ | and likewise for other cell sizes. It recommended to start with a cell size close to the assumed minimum and to employ the wavefunction restart files consecutively for the larger and smaller cell sizes to avoid a convergence to different states for compressed and enlarged cells. | ||
+ | |||
+ | Running the example above while applying the scaling factors '' | ||
+ | < | ||
+ | # a [Angstrom] | ||
+ | 8.385257 | ||
+ | 8.444310 | ||
+ | 8.502549 | ||
+ | 8.560000 | ||
+ | 8.616690 | ||
+ | 8.672644 | ||
+ | 8.727886 | ||
+ | 8.782436 | ||
+ | 8.836318 | ||
+ | 8.889550 | ||
+ | </ |
howto/dft_u.1700730875.txt.gz · Last modified: 2023/11/23 09:14 by krack