[CP2K-user] [CP2K:20973] Re: For DFT calculation of metallic system

[Frederick Stein]

>From my understanding, there are no changes to be expected. Maybe some will 
come around and fix this warning in the future.

xuan Garrett schrieb am Montag, 16. Dezember 2024 um 10:28:28 UTC+1:

> Dear Frederick,
>
> Thank you for your instant reply. I am sorry for my not careful reading of 
> this HOW TO manu. Now, I understand the meaning of this ENERGY. 
>
>
> BTW, I am wondering if CP2K will treat this warning of spin_comtamination 
> of kpoints in next released versions?
>
> Thank you so much.
> Best regards,
> Xuan
>
> Frederick Stein <f.s... at hzdr.de>于2024年12月16日 周一17:36写道：
>
>> Dear Xuan,
>> The warning is unrelated to total energies as it just means that a 
>> printed value of the spin-contamination (if there is any), is not reliable.
>> Regarding our extrapolation question, have you already considered this 
>> HOW TO: https://www.cp2k.org/howto:static_calculation ?
>> Best regards,
>> Frederick
>>
>> xuan Garrett schrieb am Sonntag, 15. Dezember 2024 um 12:39:01 UTC+1:
>>
>>> Dear cp2k,
>>>
>>> I am now testing the bulk Cu metallic system. During DFT calculation 
>>> based on GPW, I switch on the UKS T and the FERMI_DIRAC smearing for 
>>> calculation, along with the MONKHORST_PACK grids. 
>>>
>>> Now, in my cp2k out file, I find the warning that :
>>>  *** WARNING in qs_scf_post_gpw.F:1850 :: Spin contamination estimate 
>>> not ***
>>>  *** implemented for k-points.                                           
>>>  ***
>>>
>>> So, I am wondering if this warning will lead the error in the final 
>>> energy. 
>>>
>>> Since the metallic uses the smearing based on FERMI_DIRAC, the 
>>> electronic entropy is induced. So if it means that the final term of Total 
>>> FORCE_EVAL ( QS ) energy does not include the correction for electronic 
>>> entropy term (T → 0) , the used ELECTRONIC_TEMPERATURE is 300 K. That is, 
>>> the actual extrapolated ENERGY should be Total FORCE_EVAL ( QS ) energy - 
>>> T*S_ele?
>>>
>>> Attached is the inp and out file.
>>>
>>> Best regards,
>>> Xuan
>>>
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