Dear Hamed, The calculation of the susceptibility is intrinsically related to the chemical shift. Please, check these papers (below), and the GIPAW documentation.
Mauri, F., Pfrommer, B. G., & Louie, S. G. (1996). Ab initio theory of NMR chemical shifts in solids and liquids. *Physical review letters*, *77*(26), 5300. Mauri, F., & Louie, S. G. (1996). Magnetic susceptibility of insulators from first principles. *Physical review letters*, *76*(22), 4246. I hope you figure it useful. Best wishes. * Marcelo Albuquerque* * Ph.D. Student* * Physics Institute* *Universidade Federal Fluminense (UFF)* * Niterói/RJ - Brazil*
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