Anisotropy of optical absorption spectra of rare‐earth orthoaluminate DyAlO₃

Abstract

The polarization spectra of optical absorption for the 4f -4f transition 6 H 15/2 → 6 F 3/2 and 6 H 15/2 → 6 F 5/2 in the rare-earth orthoaluminate DyAlO 3 have been studied experimentally at the temperature T = 78 K. It has been shown that the non-trivial character of the polarization absorption spectra anisotropy for low temperatures can be explained by a contribution of the J -J "mixing" mechanism for the excited multiplets of the ground 4f(n) configuration of the Dy 3+ ion in the low-symmetry crystalline field in the orthoaluminate structure. The results of numerical calculations of energies and wave functions of the Stark sublevels of the excited multiplets 6 F 3/2 and 6 F 5/2 are presented for the ground 4f 9 configuration of the rare-earth Dy 3+ion in the crystalline field of C s symmetry.

Magnetic order of Dy3+ and Fe3+ moments in antiferromagnetic DyHoogeboom1, Kuschel2, Bauer3 et al. 2021Phys. Rev. B17071View full textAdd to dashboardCite

“…At low temperatures, k B T , the Dy moments behave as Ising spins tilted by an angle ±φ Dy away from the a axis in the ab plane (φ Dy = 57 • ). At high temperatures, k B T , they can be described as anisotropic Heisenberg spins with paramagnetic susceptibilities, χ Dy (χ Dy ⊥ ) for a magnetic field parallel (perpendicular) to the local spin-quantization axis (χ Dy > χ Dy ⊥ ) [46]. For k B T , the SMR resulting from the contributions of the four Dy sublattices (four Dy sites in the crystallographic unit cell of DFO) is…”