3rd International Conference Laser M2P

J. Phys. IV France 04 (1994) C4-337-C4-340
DOI: 10.1051/jp4:1994480

Spectroscopy of Mn₄₊ doped gadolinium gallium garnet in high magnetic field

A. SUCHOCKI¹, M. POTEMSKI², A. BRENIER³, C. PEDRINI³ and G. BOULON<sup>3

1</sup>  Institute of Physics, Polish Academy of Sciences, Al. Lotnikow 32/46, 02-668 Warszawa, Poland
²  High Magnetic Field Laboratory, MPIFKF [MATH] CNRS, 25 av. des Martyrs, BP. 166, 38042 Grenoble cedex 9, France
³  Laboratoire de Physico-Chimie des Matériaux Luminescents, Université Claude Bernard Lyon I, 43 bd du 11 Novembre 1918, 69622 Villeurbanne, France

Abstract
The R-lines of the Mn⁴⁺ fluorescence, associated with ² transitions in gadolinium gallium garnet exhibits large broadening as compared with other ions with d³ shell. The laser excitation and fluorescence spectra without magnetic field show that this is partially inhomogeneous broadening related to presence of charge-compensating Ca²⁺ ions. Remaining part of the broadening is due to antiferromagnetic exchange interaction between Mn⁴⁺ and surrounding them six Gd³⁺ ions. The high magnetic field up to 20 T has been used to resolve the spectra broadened by spin-spin interaction. The estimated value of the spin-spin exchange constant is equal to j ≈ 1.9 cm^-1.

© EDP Sciences 1994