Calculations of Solid Properties Using Wien2k Package
Would you like to react to this message? Create an account in a few clicks or log in to continue.

How to calculate with the LDA+U ( AFM, FM, NM )

Go down

How to calculate with the LDA+U ( AFM, FM, NM ) Empty How to calculate with the LDA+U ( AFM, FM, NM )

Post by Algerien1970 Fri 15 May - 19:51

How to calculate with the LDA+U

To apply the LDA+U there are two steps to follow:

1/ Calculate the U parameter
2/ Apply the LDA+U

Note: For the beginners, they shall start with the second step as follows:

* Create two files named: case.inorb, case.indm ( In case of complex calculation we need the file case.indmc instead of case.indm ) from the SCR templates in wien2k manually

* We can start with NiO example with d orbitals

* Here the two files for NiO: ( we use the antiferromagnetic structure with two atoms Ni1 and Ni2)

* The calculation is done with spin-polarized case


How to calculate with the LDA+U ( AFM, FM, NM ) 10432533_10205478821792461_3367871927421376423_n



------------------ top of file: case.indm --------------------
-9.                       Emin cutoff energy
2                         number of atoms for which density matrix is calculated
1  1  2                  index of 1st atom, number of L's, L1
2  1  2                  index of 2nd atom, number of L's, L1
0 0                   r-index, (l,s)-index
------------------- bottom of file ------------------------


Last edited by Algerien1970 on Sat 4 Jul - 1:09; edited 7 times in total
Algerien1970
Algerien1970
Forum Manager
Forum Manager

Messages : 485
Date d'inscription : 2015-05-14

https://wien2k.forumalgerie.net

Back to top Go down

How to calculate with the LDA+U ( AFM, FM, NM ) Empty Re: How to calculate with the LDA+U ( AFM, FM, NM )

Post by Algerien1970 Fri 15 May - 19:56

For the non magnetic or ferromagnetic (spin-polarized ) calculations where we have one atom Ni the two files will be as follows:


---------------- top of file: case.inorb --------------------
1  1  0                        nmod, natorb, ipr
PRATT,1.0                      mixmod, amix
1 1 2                          iatom nlorb, lorb
1                              nsic (LDA+U(SIC) used)
0.52 0.0                       U J

---------------- bottom of file:  --------------------


------------------ top of file: case.indm --------------------
-9.                         Emin cutoff energy
1                           number of atoms for which density matrix is calculated
1  1  2                   index of 1st atom, number of L's, L1
0 0                       r-index, (l,s)-index
------------------- bottom of file ------------------------
Algerien1970
Algerien1970
Forum Manager
Forum Manager

Messages : 485
Date d'inscription : 2015-05-14

https://wien2k.forumalgerie.net

Back to top Go down

How to calculate with the LDA+U ( AFM, FM, NM ) Empty Re: How to calculate with the LDA+U ( AFM, FM, NM )

Post by Algerien1970 Sat 4 Jul - 1:13

NOTE :  

If you want to force a non-magnetic solution you can constrain the spin-polarization to zero using runsp_c_lapw.
Algerien1970
Algerien1970
Forum Manager
Forum Manager

Messages : 485
Date d'inscription : 2015-05-14

https://wien2k.forumalgerie.net

Back to top Go down

How to calculate with the LDA+U ( AFM, FM, NM ) Empty Re: How to calculate with the LDA+U ( AFM, FM, NM )

Post by Sponsored content


Sponsored content


Back to top Go down

Back to top

- Similar topics

 
Permissions in this forum:
You cannot reply to topics in this forum