Observation of the hyperfine structure and anticrossings of hyperfine levels in the luminescence spectra of LiYF:Ho.

Resolved hyperfine structure and narrow inhomogeneously broadened lines in the optical spectra of a rare-earth-doped crystal are favorable for the implementation of various sensors. Here, a well-resolved hyperfine structure in the photoluminescence spectra of LiYF:Ho single crystals and the anticrossings of hyperfine levels in a magnetic field are demonstrated using a self-made setup based on a Bruker 125HR high-resolution Fourier spectrometer. This is the first observation of the resolved hyperfine structure and anticrossing hyperfine levels in the luminescence spectra of a crystal.

Data on vibrational spectra of the langasites LnCrGeBeO (Ln = La, Pr, Nd) and calculations.

In "Lattice dynamics and structure of the new langasites LnCrGeBeO (Ln = La, Pr, Nd): vibrational spectra and calculations" [1], experimental and calculated results on lattice dynamics of the recently discovered new compounds LaCrGeBeO, PrCrGeBeO, and NdCrGeBeO are reported. These compounds belong to the langasite series and constitute a new class of low-dimensional antiferromagnets. The data presented in this article includes IR diffuse transmission spectra of powder samples of LnCrGeBeO (Ln = La, Pr, Nd) registered at room temperature with a Bruker 125HR Fourier spectrometer, Raman spectra taken in the backscattering geometry (also at room temperature) with a triple monochromator using the line 514, 5 nm of an argon laser as an excitation, results of the DFT calculations with the B3LYP and PBE0 hybrid functionals on the optimized crystal structures, eigenfrequencies and eigenvectors of the normal vibrational modes.