Faculty Publications

Spectroscopic and magnetic susceptibility analyses of the 7 FJ and 5 D4 energy levels of Tb3+(4f8 ) in TbAlO3

Document Type

Article

Publication Date

1-1-2008

Abstract

Detailed analyses of spectroscopic and temperature-dependent magnetic susceptibility data are reported for the crystal-field split energy levels of the 7FJ and 5D4 of Tb3+ in stoichiometric single crystals of ortho-aluminate TbAlO3. The spectroscopic data include absorption spectra obtained between 2940 and 480 nm from 8 to 300 K. High resolution fluorescence spectra are reported, representing transitions from 5D4 to 7F6,5,4, at a sample temperature of 85 K. Using crystal-field modeling techniques recently adapted for low symmetry systems, we have assigned all 58 experimental Stark levels within the 7FJ and 5D4 manifolds, with a fitting standard deviation of 4.5 cm-1 (3.8 cm-1 rms error). As a further test, the theoretical Stark levels and calculated wavefunctions were used to determine the temperature dependence of the magnetic susceptibility along the c-axis of the TbAlO3 crystal. Good agreement is obtained between the calculated susceptibility and temperature-dependent magnetic data reported earlier, including a prediction of a 0.2 cm-1 splitting of the ground-state quasi-doublet. The susceptibility calculation also confirms the predicted ordering of states within the 7F6 multiplet manifold.

Journal Title

Journal of Luminescence

Volume

128

First Page

1271

Last Page

1284

First Department

Physics

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