Abstract
AbstractThe optical and infrared absorption as well as the magnetic circular dichroism (mcd) of the transparent ferromagnet K2CuF4 were measured in the paramagnetic and ferromagnetic regions. The absorption bands at 7900, 9500, and at 12300 cm−1 were assigned to the crystal field transitions 2A1g → 2B1g, 2Eg, 2B2g of the Cu2+ ions in the tetragonally distorted octahedral symmetry. A pronounced vibrational structure, with a zero‐phonon line at 8775 cm−1, was identified on the low energy side of the 9500 cm−1 band and compared with the infrared absorption bands between 600 and 1100 cm−1. The first moment change of the MCD band corresponding to the absorption around 9500 cm−1 was explained by the non zero orbital angular momentum in the 2Eg state. The mcd results obtained near the ferromagnetic Curie temperature wer compared with the magnetic properties of the crystal.
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