Rare case of magnetic Ag${}^{3+}$ ion: double perovskite Cs${}_2$KAgF${}_6$

Ting Jia, Xiaoli Zhang, Ting Liu +5

Normally $4d$ or $5d$ transition metals are in a low-spin state. Here using first-principles calculations, we report on a rare case of a high-spin $S$=1 magnetic state for the Ag$^…