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Articolo in rivista, 2011, ENG, 10.1007/s00340-011-4421-7

Spectroscopic analysis of Pr3+ crystal-field transitions in YAl3(BO3)4

M. Mazzera 1, A. Baraldi 1, E. Buffagni 2, R. Capelletti 1, E. Beregi 3, I. Földvári 3, N. Magnani 4

1 Physics Department, University of Parma, viale G.P. Usberti 7/A, 43124 Parma, Italy; 2 IMEM-CNR Institute, Parco Area delle Scienze 37/A, 43124 Parma, Italy; 3 Research Institute for Solid State Physics and Optics, HAS, Konkoly-Thege ut 29-33, 1121 Budapest, Hungary; 4 Chemical Sciences Division, Lawrence Berkeley National Laboratory, 1 Cyclotron Road Mail Stop 70A1150 Berkeley, CA 94720-8175, USA

Yttrium aluminium borate single crystals, doped with 1 and 4 mol% of Pr3+, were analyzed in the wave number range 500-25000 cm-1 and temperature range 9-300 K by means of high-resolution Fourier transform spectroscopy. In spite of the complex spectra, exhibiting broad and split lines, the energy level scheme was obtained for several excited manifolds. The careful analysis of the spectra as a function of the temperature allowed us to identify most of the sublevels of the ground manifold. The thermally induced line shift, well described by a single-phonon coupling model, could be exploited to provide information about the energy of the phonons involved. The orientation of the dielectric ellipsoid and of the dipole moments associated to a few transitions was also determined from linear dichroism measurements. The experimental data were fitted in the framework of the crystal-field theory, but the agreement was not satisfactory, as already reported for Pr3+ ion in other matrices. Additional discrepancies came from the dichroic spectra analysis and the line splitting, possibly associated to hyperfine interaction. Some causes which might be responsible for the difficulties encountered in the Pr3+ ion theoretical modelling are discussed.

Applied physics. B, Lasers and optics (Print) 104 (3), pp. 603–617