Abstract

The spin and lattice dynamics of the R2CuO4 quasi-2D antiferromagnetic crystals (R=Pr, Nd, Sm, Eu, Gd) were studied in the millimeter-range electromagnetic wave band. Strong variations of the absorption coefficient were observed to occur at temperatures T≈T0. Absorption lines of electrical nature due to lattice dynamics were also revealed near the T0 temperatures. The observed anomalies are assumed to originate from phase transitions at T≈T0, which entail changes in the structural and magnetic properties.

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