Faraday effect in Tb3Ga5O12 in a rapidly increasing ultrastrong magnetic field

Magnetooptics of quintet states of Tb3+ ion in terbium–yttrium aluminum garnet

“…A dominating contribution to the mechanism of removal of the parity prohibition from the 4f-4f transitions in TbYAG garnet is made by "mixing" of an odd symmetrical component of the CF of the D 2 symmetry of the mixed excited configuration 4f (7) 5d (l′ = 2) with the states of the ground 4f (8) (l = 3) configuration of the RE ion. In this case, the spin prohibition for the transitions under consideration is lifted in the second order of the perturbation theory by the spin -orbital interaction "mixing" the multiplets 5d of the Tb 3+ ion [21].…”

“…The alternating-sign shape of the magnetooptical spectrum characteristic of the "diamagnetic" contribution of the non-Kramers ion to the MCD (see Eq. (1)) corresponds to intensive (and relatively narrow) absorption lines -16 and -31 connected with the 4f-4f transitions from the ground quasi-doublet (Г 1 , Г 3 ) of the 7 F 6 multiplet to the excited quintet states 5 L 10 and 5 G 5 of the 4f (8) configuration of the RE Тb 3+ ion in YAG [4]. This is connected with the fact that for the narrow absorption lines the frequency dependence is defined by the first derivative of the absorption line contour which value significantly increases with decrease in the absorption line width Г (∼1/Г 2 ).…”

“…This allows one to define the double values of the products of the slope angles of the MCPL degree spectra / Ρ ν ∆ ∆ for the lines -3 (2Г ≈ 7.2 сm Identification of the observed features of a A′-type in the MCPL degree spectrum (see Fig. 1) with the radiative transitions occurring between the Stark sublevels of the excited 5 D 4 and ground 7 F 6 multiplets of the (8) 4 f configuration of the RE Tb 3+ ion in YAG can be made by considering the selection rules for the dipole moment components of the optical transitions defining a value (and sign) of the A′-member of the MCPL degree in Eqs. (2) and (4).…”

“…The Stark structure of the energy states of the ground 4f (8) -electronic configuration of the rare-earth (RE) Tb 3+ ion in the garnet structure was actively studied and analyzed in [1][2][3][4]. It was shown that the features and greater values of magnetic [5], magnetoelastic [6] and magnetooptical [7 -10] effects observed in pure (and doped by yttrium) terbium garnets-gallates and aluminates are connected with a specific character of Stark splitting of the Tb 3+ ion.…”

“…Therefore, the aim of this work is to present experimental studies of the energy spectrum Stark splitting for excited quintet states -multiplets 5 (8) -electronic configuration of the non-Kramers Tb 3+ ion in the yttrium-aluminum garnet matrix the features of which were recently predicted in [4]. Another goal of this work is the search of both the quasi-doublet states for which the great values of magnetooptical effects are revealed more pronounced and the wave functions symmetry for quasi-doublets in multiplets 7 Below the results of the study of optical (absorption, luminescence) and magnetooptical (MCD, MCPL) spectra of terbium-yttrium aluminum garnet within the visible and close ultraviolet (UV) spectral range are presented.…”