Anisotropic spin-spin interaction of Dy3+ ion pairs associated with a color center in crystal CaF2
Kazanskii S.A.
While studying the EPR of complex color centers in a CaF2 :Dy crystal by means of an optical detection method we observed an EPR signal with an anomalously high value of gl{ = 36.4+ (gL < 10) which is attributed to pairs of Dy3 + ions that are coupled by anisotropic ferromagnetic exchange interaction.