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title: KKRSusc Quickstart Guide
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---
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# Perform a KKRsusc calculation
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In order to investigate spin-excitations via the KKRsusc program please
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### Serial Run
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- For this run set `lhdio=F` and 'lrestart=T'. Use one core for the calculation, with a large amount of memory (usually more than 100Gb).
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- For this run set `lhdio=F` and `lrestart=T`. Use one core for the calculation, with a large amount of memory (usually more than 100Gb).
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- In the output, check if the physical quantities agree with the results from the impurity run (ie. spin moment, charge etc). A small difference of ~1% is to be expected. The files containing the susceptibility information are `ia*.chif`, `ia*.chid`, `ia*.chi0`.
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