Dear All,

I am performing QE calculations by controlling the magnetic state using the 
keyword" starting_magnetization(1)". The systems that I am studying are Fe-N4 
embedded graphene with adsorbed atoms (e.g. Cl, B, F, H, N,P). For each system, 
I found the total energy is always the same whatever -1 or 1 was used for this 
option.  



Up: Final energy=-1074.7364064258 Ry, total magnetization=1.99 Bohr mag/cell
Dw: Final energy=-1074.7364064357 Ry, total magnetization=-1.99 Bohr mag/cell


Actually, I am new to magnetism, and just can not understand why the choice of 
different spin orientations leads to completely the same total energy. Can 
anyone tell me what's wrong with my calculations? or Should we accept the fact 
that controlling the spin orientations does not affect the total energy ? Is 
this a common sense in physics?



 &CONTROL
                
 calculation = 'relax' ,
               
 restart_mode = 'from_scratch' ,
                     
 outdir = './' ,
                 
 pseudo_dir = '/home/jibiaoli/pseudo/' ,
                     
 prefix = '2d' ,
                      
 nstep = 199 ,
 /
 &SYSTEM
                      
 ibrav = 8,
                  
 celldm(1) = 23.59760901,
                  
 celldm(2) = 0.592429525,
                  
 celldm(3) = 1.5817524,
                        
 nat = 36,
                       
 ntyp = 4,
                    
 ecutwfc = 49 ,
                    
 ecutrho = 511 ,
                
 occupations = 'smearing' ,
                    
 degauss = 0.04D0 ,
                   
 smearing = 'gaussian' ,
                      
 nspin = 2,
   constrained_magnetization = 'atomic',
   starting_magnetization(1) = 1,
   starting_magnetization(2) = 0,
   starting_magnetization(3) = 0,
   starting_magnetization(4) = 0,
 /
 &ELECTRONS
            
electron_maxstep = 299,
                
 mixing_beta = 0.2D0 ,
             
diagonalization = 'david' ,
 /
 &IONS
               
 ion_dynamics = 'bfgs' ,
 /
ATOMIC_SPECIES
   Fe   55.850  Fe.pbe-spn-kjpaw_psl.1.0.0.UPF
    N   14.007  N.pbe-n-kjpaw_psl.1.0.0.UPF
    C   12.010  C.pbe-n-kjpaw_psl.1.0.0.UPF
   Cl   35.453  Cl.pbe-n-kjpaw_psl.1.0.0.UPF
ATOMIC_POSITIONS angstrom
Cl            
6.9340166756        
3.6989245228        2.6428176290
Fe            
6.9340166756        
3.6989245228        0.8728176290  
N             
5.6059434603        
2.4072809825        0.8730142439
N             
5.6059434603        
4.9905680641        0.8730142439
N             
8.2619454617        
2.4072286380        0.8730110298
N             
8.2619454617        
4.9906204086        0.8730110298
C            
-0.0178633308        
0.0000000000        0.8730568507
C            
-0.0178354701        
2.4770183342        0.8730574443
C            
-0.0178354701        
4.9208307125        0.8730574443
C             
2.0828914672        
1.2436366562        0.8730559742
C             
2.1294070947        
3.6989245238        0.8730543580
C             
2.0828914672        
6.1542123905        0.8730559742
C             
4.1515598342        
0.0000000000        0.8730547888
C             
4.2422651536        
2.4525822834        0.8730507905
C             
4.2422651536        
4.9452667633        0.8730507905
C             
6.2369236427        
1.2005616382        0.8730586550
C             
6.2369236427        
6.1972874084        0.8730586550
C             
8.3173386913        
0.0000000000        0.8730685226
C            
10.3713556874        
1.2412551379        0.8730644966
C            
10.3159798880        
3.6989245238        0.8730564313
C            
10.3713556874        
6.1565939088        0.8730644966
C             
1.3983816512        
0.0000000000        0.8730550420
C             
1.3982497647        
2.4770211151        0.8730548598
C             
1.3982497647        
4.9208279316        0.8730548598
C             
3.4964768966        
1.2412907830        0.8730582823
C             
3.5518074884        
3.6989245238        0.8730504409
C             
3.4964768966        
6.1565582637        0.8730582823
C             
5.5504587549        
0.0000000000        0.8730644983
C             
7.6308954080        
1.2005515154        0.8730595405
C             
7.6308954080        
6.1972975312        0.8730595405
C             
9.7162145171        
0.0000000000        0.8730613644
C             
9.6256116280        
2.4525476568        0.8730541166
C             
9.6256116280        
4.9453013898        0.8730541166
C            
11.7849236132        
1.2436057457        0.8730599352
C            
11.7383344691        
3.6989245238        0.8730590021
C            
11.7849236132        
6.1542433010        0.8730599352
K_POINTS automatic 
  1 2 1   0 0 0 



 &CONTROL
                
 calculation = 'relax' ,
               
 restart_mode = 'from_scratch' ,
                     
 outdir = './' ,
                 
 pseudo_dir = '/home/jibiaoli/pseudo/' ,
                     
 prefix = '2d' ,
                      
 nstep = 199 ,
 /
 &SYSTEM
                      
 ibrav = 8,
                  
 celldm(1) = 23.59760901,
                  
 celldm(2) = 0.592429525,
                  
 celldm(3) = 1.5817524,
                        
 nat = 36,
                       
 ntyp = 4,
                    
 ecutwfc = 49 ,
                    
 ecutrho = 511 ,
                
 occupations = 'smearing' ,
                    
 degauss = 0.04D0 ,
                   
 smearing = 'gaussian' ,
                      
 nspin = 2,
   constrained_magnetization = 'atomic',
   starting_magnetization(1) = -1,
   starting_magnetization(2) = 0,
   starting_magnetization(3) = 0,
   starting_magnetization(4) = 0,
 /
 &ELECTRONS
            
electron_maxstep = 299,
                
 mixing_beta = 0.2D0 ,
             
diagonalization = 'david' ,
 /
 &IONS
               
 ion_dynamics = 'bfgs' ,
 /
ATOMIC_SPECIES
   Fe   55.850  Fe.pbe-spn-kjpaw_psl.1.0.0.UPF
    N   14.007  N.pbe-n-kjpaw_psl.1.0.0.UPF
    C   12.010  C.pbe-n-kjpaw_psl.1.0.0.UPF
   Cl   35.453  Cl.pbe-n-kjpaw_psl.1.0.0.UPF
ATOMIC_POSITIONS angstrom
Cl            
6.9340166756        
3.6989245228        2.6428176290
Fe            
6.9340166756        
3.6989245228        0.8728176290  
N             
5.6059434603        
2.4072809825        0.8730142439
N             
5.6059434603        
4.9905680641        0.8730142439
N             
8.2619454617        
2.4072286380        0.8730110298
N             
8.2619454617        
4.9906204086        0.8730110298
C            
-0.0178633308        
0.0000000000        0.8730568507
C            
-0.0178354701        
2.4770183342        0.8730574443
C            
-0.0178354701        
4.9208307125        0.8730574443
C             
2.0828914672        
1.2436366562        0.8730559742
C             
2.1294070947        
3.6989245238        0.8730543580
C             
2.0828914672        
6.1542123905        0.8730559742
C             
4.1515598342        
0.0000000000        0.8730547888
C             
4.2422651536        
2.4525822834        0.8730507905
C             
4.2422651536        
4.9452667633        0.8730507905
C             
6.2369236427        
1.2005616382        0.8730586550
C             
6.2369236427        
6.1972874084        0.8730586550
C             
8.3173386913        
0.0000000000        0.8730685226
C            
10.3713556874        
1.2412551379        0.8730644966
C            
10.3159798880        
3.6989245238        0.8730564313
C            
10.3713556874        
6.1565939088        0.8730644966
C             
1.3983816512        
0.0000000000        0.8730550420
C             
1.3982497647        
2.4770211151        0.8730548598
C             
1.3982497647        
4.9208279316        0.8730548598
C             
3.4964768966        
1.2412907830        0.8730582823
C             
3.5518074884        
3.6989245238        0.8730504409
C             
3.4964768966        
6.1565582637        0.8730582823
C             
5.5504587549        
0.0000000000        0.8730644983
C             
7.6308954080        
1.2005515154        0.8730595405
C             
7.6308954080        
6.1972975312        0.8730595405
C             
9.7162145171        
0.0000000000        0.8730613644
C             
9.6256116280        
2.4525476568        0.8730541166
C             
9.6256116280        
4.9453013898        0.8730541166
C            
11.7849236132        
1.2436057457        0.8730599352
C            
11.7383344691        
3.6989245238        0.8730590021
C            
11.7849236132        
6.1542433010        0.8730599352
K_POINTS automatic 
  1 2 1   0 0 0 




Dr. Jibiao Li, 
Department of Material Science and Engineering
Yangtze Normal University
Juxian Dadao 16#, Fuling, Chongqing, China
Email: [email protected], [email protected], [email protected]
Homepage: https://www.researchgate.net/profile/Jibiao_Li
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