Abstract
The heavy lanthanide selenides AgLnSe 2 (Ln=Ho–Yb) crystallize in the orthorhombic AgErSe 2 type structure ( P2 12 12 1 ). The lanthanide ions are placed in the centres of slightly distorted octahedra, whereas each of the silver ions is surrounded by four selenide ions forming a strongly distorted tetrahedron. The high field magnetization (up to 14 T) and the magnetic susceptibility were measured on the polycrystalline samples. The crystal field parameters were estimated from the field dependences of the magnetizations, assuming a rhombic distortion of LnSe 6 octahedra. The magnetic susceptibilities were also calculated using the same set of the crystal field parameters. None of the compounds described here undergoes a magnetic transition above 4.2 K.
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