Transferred hyperfine interaction and zero field splitting of the Gd3+ ion in KY3F10

EPR of Gd3+ in single crystal colquiriite and analysis of the spin Hamiltonian tensorsB 4 andB 6

“…This fact convincingly shows that the superposition model of SH for Gd 3 § cannot be a basis for discussion of correlation between the SH and the CF parameters. The nega-Correspond to the SH of symmetry D 3d• only the relative signs of B LM are determined.tive sign of B4c for such complicated coordination complexes as an antiprism [Gd(4F + 4F)][28] (the antiprism can result from cube by relative rotation of two parallel basis on 45 o) and[GdFg] …”

Electron paramagnetic resonance parameters and local structure for Gd3+ in KY3F10

“…The Y 3+ may be described as occupying the approximate face centers of a simple cubic lattice with a cube edge half the value of the full structure and located at the vertices of a network of corner-sharing octahedra [1,2,16]. Thus, the impurity Gd 3+ is surrounded by eight nearest F − ions forming an antiprism [GdF 8 ] 5− cluster.…”

“…Among the host Y-F bonds, four of them are at the distance R 1 (≈2.329Å), the angles θ 1 (≈130.8 • ) and φ 1 (≈45 • ), and the other four at a different distance R 2 (≈2.193 A), the angles θ 2 (≈60 • ) and φ 2 (≈0 • ). Here θ j and φ j (j = 1, 2) denote the polar angles between R j and Z (or C 4 ) and azimuth angles between R j and the X-axes of the crystal, respectively [16]. As mentioned before, the impurity-ligand bonding length R j and angle θ j in the doped crystal may be unlike the host values R j and θ j , because the ionic radius r i (≈0.938Å [17]) of the host Gd 3+ is larger than the radius r h (≈0.893Å [17]) of the host Y 3+ .…”

“…Nevertheless, compared with the EPR investigations on the ions (e.g., Sm 3+ , Dy 3+ , Yb 3+ ) with non-zero orbital angular momentum in crystals, the studies on the 8 S 7/2 Gd 3+ ion with quenched angular momentum (L = 0) are relatively scarce due to complexity of the problem, and the measurements for Gd 3+ ion in fluorides are even fewer. For example, EPR experiments have been carried out on Gd 3+ -doped KY 3 F 10 [16]. For the measured EPR parameters, zero-field splittings (ZFSs) b 0 2 , b 0 4 , b 4 4 , b 0 6 , b 4 6 and the g factor at room temperature, only the rank-2 ZFS b 0 2 was theoretically analysed [16].…”

“…For example, EPR experiments have been carried out on Gd 3+ -doped KY 3 F 10 [16]. For the measured EPR parameters, zero-field splittings (ZFSs) b 0 2 , b 0 4 , b 4 4 , b 0 6 , b 4 6 and the g factor at room temperature, only the rank-2 ZFS b 0 2 was theoretically analysed [16]. Up to now, however, the rank-4 and rank-6 ZFSs b 0 4 , b 4 4 , b 0 6 , b 4 6 and the g factor have not been quantitatively interpreted.…”