Isotope structure in optical spectra of LiYF_{4}:Ho^{3+}

Magnetic excitations near the quantum phase transition in the Ising ferromagnetLiHoF4

“…Their different zero-point motion might cause a site-random distortion of the crystal-field Hamiltonian, and isotope shifts in the optical transitions of dilute LiHo x Y 1−x F 4 have been reported. 37 We found that T c = 1.53± 0.03 in a crystal prepared exclusively with the 7 Li isotope, exactly the same as in natural Li samples. This result will be supplemented with a study of the critical field as a function of temperature.…”

19F nuclear spin relaxation and spin diffusion effects in the single-ion magnet LiYF4:Ho3+

“…There is only one holmium isotope, 165 Ho, with nuclear spin I = 7/2. The free ion ground state, the 5 I 8 multiplet, is split by the tetragonal crystal field into 13 sublevels with a Γ 34 doublet ground state and the first excited Γ 2 singlet at 6.85 cm -1 higher energy (here Γ is the corresponding irreducible representation of the S 4 point symmetry group) [26,27]. The electronic and nuclear states are mixed mainly by the magnetic hyperfine interaction H hf =A (A = 0.795 GHz [26]).…”

High resolution absorption spectroscopy on rare earth doped insulating materials: BaY2F8 and YAl3(BO3)4 single crystals and sol‐gel silica glasses

“…In Fig. 3c the 9 K optical absorption spectrum for the Ho the interactions between the electronic dipole moment and the holmium nuclear moment has been exploited as a very sensitive tool to monitor the magnetic field at the nucleus and the RE electronic states coupling to the lattice [26,27]. The crystal field analysis previously described now includes in the Hamiltonian a contribution in the form V = A J J⋅I, where Ι is the nuclear total spin (for Ho 3+ I = 7/2); it should be remarked that such a contribution, without adding new free parameters in the fitting (the value of the hyperfine interaction constant A J can be found in [28]), accounts for most of the observed hyperfine split- tings.…”