WRT NMRCUR

WRT_NMRCUR = 0 | 1 | 2 | 3 | 4
Default: WRT_NMRCUR = 0  Description: Allows to write the NMR current response in atomic units to file.

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In conjunction with LCHIMAG = True, WRT_NMRCUR allows to write the current response on the fine grid NGXF x NGYF x NGZF in atomic units (hartree bohr$^{-2}$) to an external magnetic field within linear response NMR. The output is written to NMRCURBX, NMRCURBY, and/or NMRCURBZ depending on the selected direction of the perturbing $\mathbf{B}$ field:

• WRT_NMRCUR = 0: no current response written to file (default)
• WRT_NMRCUR = 1: $B_x$
• WRT_NMRCUR = 2: $B_y$
• WRT_NMRCUR = 3: $B_z$
• WRT_NMRCUR = 4: all three directions of $\mathbf{B}=(B_x,B_y,B_z)^T$

It is also written to vaspout.h5, if compiled with HDF5 support. You can find the data groups

 /results/nmrcurbx        Group
 /results/nmrcurbx/grid   Dataset {3}
 /results/nmrcurbx/structure Group
 /results/nmrcurbx/structure/position Group
 /results/nmrcurbx/structure/position/direct_coordinates Dataset {SCALAR} 
 /results/nmrcurbx/structure/position/ion_sha256 Dataset {1}
 /results/nmrcurbx/structure/position/ion_types Dataset {1}
 /results/nmrcurbx/structure/position/lattice_vectors Dataset {3, 3}
 /results/nmrcurbx/structure/position/number_ion_types Dataset {1}
 /results/nmrcurbx/structure/position/position_ions Dataset {2, 3}
 /results/nmrcurbx/structure/position/scale Dataset {SCALAR}
 /results/nmrcurbx/structure/position/system Dataset {SCALAR}
 /results/nmrcurbx/values Dataset {3, 24, 24, 24}

and use py4vasp to access these, e.g., using

import py4vasp as pv
calc = pv.Calculation.from_path(".")
py4vasp.current_density.plot("NMR(bx)")

Warning: For bulk calculations you must switch off the use of symmetry. In other words, set ISYM <= 0 if there is more than a single k point at zero (the Γ point).

Tip: Consider switching on current augmentation (LLRAUG = True).

Related tags and articles

LCHIMAG, LLRAUG