Re: [Wien] Confusion regarding AFM structure of a spinel compound

2021-07-19 Thread Peter Blaha
NO !!! NEVER again initialize. All your previous efforts are gone. Just run: save_lapw relaxed_4k-points (if not already done) x kgen with as many k-points as you want. runsp ... (first without -min, because most likely the forces will not change with the bigger k-mesh). Am 7/19/21

Re: [Wien] Confusion regarding AFM structure of a spinel compound

2021-07-19 Thread shamik chakrabarti
Dear Prof. Blaha, Thank you for your advice. However, I have few queryes. For a big cell-like 56 atomic cell semiconductor, can I consider 4 k points during structure optimization while 14 k-points during energy calculation with the optimized structure (*the step 4*)? If I

Re: [Wien] Confusion regarding AFM structure of a spinel compound

2021-07-19 Thread Peter Blaha
(1) runsp_lapw -dm -orb -fc 1.0 -ec 0.0001 -min (2) Taking the optimized structure from the previous run, I have started force minimization by min-j" runsp_lapw .. (3) I have copied the final structure as has been obtained in the force minimization & take it to a different directory for

Re: [Wien] Confusion regarding AFM structure of a spinel compound

2021-07-19 Thread shamik chakrabarti
Dear Prof. Blaha, I have optimized the structure by the following methods; (1) runsp_lapw -dm -orb -fc 1.0 -ec 0.0001 -min (2) Taking the optimized structure from the previous run, I have started force minimization by min-j" runsp_lapw .. (3) I have copied the final

Re: [Wien] Confusion regarding AFM structure of a spinel compound

2021-07-19 Thread Peter Blaha
                  I am working on a frustrated AFM ordering in which both the atom with spin up & spin down remains at the octahedral site. I have simulated the same structure with U=4 eV & which works well. However, when I shifted to U=6 eV the structure showed AFM during structure

Re: [Wien] Confusion regarding AFM structure of a spinel compound

2021-07-19 Thread shamik chakrabarti
Dear Prof. Marks, I am working on a frustrated AFM ordering in which both the atom with spin up & spin down remains at the octahedral site. I have simulated the same structure with U=4 eV & which works well. However, when I shifted to U=6 eV the structure showed AFM during

Re: [Wien] Confusion regarding AFM structure of a spinel compound

2021-07-19 Thread Laurence Marks
Without the struct nobody can do more than guess. My guess. In spinel you have any octahedral & tetrahedral sites. You put one spin (Up) on octahedral sites, and the other (Dn) on tetrahedral. This won't work. _ Professor Laurence Marks "Research is to see what everybody else has seen, and

[Wien] Confusion regarding AFM structure of a spinel compound

2021-07-19 Thread shamik chakrabarti
Dear Wien2k users, I was running AFM calculation of a spinel compound by flipping the spin in case.inst & by running spin polarize calculation. During structure optimization, the AFM structure appears well with zero moments per unit cell. However, when I have started an SCF by