J. Phys. IV France 04 (1994) C4-337-C4-340
Spectroscopy of Mn4+ doped gadolinium gallium garnet in high magnetic fieldA. SUCHOCKI1, M. POTEMSKI2, A. BRENIER3, C. PEDRINI3 and G. BOULON3
1 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
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