Hyperfine and transferred hyperfine interaction of Cr3+ in yal and lual garnets

Abstract The hyperfine field at the 53Cr nucleus and the transferred hyperfine field at the Al3+ neighbours at the next octahedra sites were measured with ENDOR at Cr3+‐doped YAlG and LuAlG single crystals. The electric field gradient at the octahedrally surrounded lattice sites could be determined by the quadrupole interaction with the 27Al nucleus. From the measured quadrupole splitting of 53C13+ a new value of the 53Cr quadrupole moment of |Q| =0.082 b is derived. The magnetic part of the transferred hyperfine interaction between the Cr3+ ion and the A1 nuclei at the next octahedra sites could be well described assuming a point‐dipole model.