Abstract
We report on the crystal-field (CF) levels of Nd3+ in Nd3CrGe3Be2O14, a representative of recently synthesized Be-containing langasites. They are the first in the family to contain two magnetic subsystems, 1D chromium and Kagome-like rare-earth ones. High-resolution broad-band temperature-dependent spectra allow us to find all five CF Kramers doublets of the ground 4I9/2 CF multiplet and 38 levels of the excited 4I11/2, 13/2, 15/2, 4F3/2, 4F5/2 + 2H9/2, 4F7/2 + 4S3/2 and 4F9/2 CF multiplets. These data form a basis for a future exploration of this interesting two-sublattice magnet with frustrated interactions. Optical transitions between Kramers doublets of Nd3+ indicate magnetic activity of 1D-chromium chains at T < 20 K.
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