Magnetic form Factor for Metallic Gadolinium

Magnetic form factor calculations have been performed using 4f wave functions obtained from relativistic Hartree‐Fock‐Slater calculations for free, and Wigner‐Seitz, gadolinium atoms and ions. Only small differences exist between our results for free Gd^o and free Gd³⁺, and between free‐atom and Wigner‐Seitz results for Gd^o; however, significant changes are observed as the amount of exchange is varied in the Hartree‐Fock‐Slater calculation. A comparison of our results with previous calculations and recent experiments led us to conclude that conduction electron screening produces only minor effects on the form factor, with the major difference between experiment and previous calculation probably being due to indirect relativistic screening.