Abstract
Novel quaternary rare-earth copper sulfides EuRCuS3 (R = Y, Gd–Lu excluding Ho, Er) have been investigated by means of x-ray diffraction, magnetic susceptibility, magnetization, and specific heat measurements. These compounds crystallize in the Eu2CuS3-type structure for R = Y, Gd–Dy and in the KZrCuS3-type structure for R = Tm–Lu. Both EuY CuS3 and EuLuCuS3 show a ferromagnetic transition and the other EuRCuS3 compounds show a ferrimagnetic transition at around 5.0 K.
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