 &control
    calculation = 'scf'
    tstress = .true.
    tprnfor = .true.
 /
 &system
    ibrav=  0, celldm(1)=8.19, nat=  4, ntyp= 3,
    ecutwfc = 40.0, ecutrho = 320.0,
    starting_magnetization(1)= 0.0,
    starting_magnetization(2)= 0.5,
    starting_magnetization(3)=-0.5,
    occupations='smearing', smearing='gauss', degauss=0.01,
    nspin=2,
    lda_plus_u=.true.,
    lda_plus_u_kind = 0,
    U_projection_type = 'atomic',
    Hubbard_U(1)=5.0, 
    Hubbard_U(2)=5.0,
    Hubbard_U_back(1) = 2.0
    Hubbard_U_back(2) = 2.0
    backall(1) = .true.
    backall(2) = .true.
    lback(1)  = 0
    l1back(1) = 1
    lback(2)  = 0
    l1back(2) = 1
 /
 &electrons
    mixing_mode = 'plain'
    mixing_beta = 0.3
    conv_thr =  1.0d-10
 /
ATOMIC_SPECIES
 Fe1  1.  Fe.pbe-spn-rrkjus_psl.0.2.1.UPF
 Fe2  1.  Fe.pbe-spn-rrkjus_psl.0.2.1.UPF
 O    1.  O.pbe-rrkjus.UPF
ATOMIC_POSITIONS {crystal}
 Fe1 0.0  0.0  0.0
 Fe2 0.5  0.5  0.5
 O   0.25 0.25 0.25
 O   0.75 0.75 0.75
CELL_PARAMETERS {alat}
0.50 0.50 1.00
0.50 1.00 0.50
1.00 0.50 0.50
K_POINTS {automatic}
2 2 2 0 0 0
