Magnetic field effects on the fluorescence of Cr3+ in GdAlO3 |
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| Authors: | J.S. Helman R.A. Carvalho H. Panepucci M.C. Terrile M.A. Aegerter E. Soarez |
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| Affiliation: | Departamento de Física, Centro de Investigación del Instituto Politécnico Nacional, Ap. Postal 14-740, México 14, D.F., México;Departamento de Física e Ciencia dos Materiais, Instituto de Física e Química de São Carlos, Universidade de São Paulo, 13560 São Carlos, SP, Brazil;Departamento de Física, Universidade Federal de Pernambuco, Recife, Brazil |
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| Abstract: | The fluorescence spectrum of Cr3+ in GdAlO3 has been examined at 4.2 K as a function of magnetic field up to 60 kG. The resulting splitting of the 2E → 4A2 emission lines are explained in terms of a modified molecular field approximation, which incorporates the effect of the spin fluctuations. The exchange constant in the relaxed excited state is found to be 1.2 cm-1, which differs from that reported from absorption data. It is suggested that the difference may be related to the Frank-Condon effect. |
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