Abstract
Specific heat, ac magnetic susceptibility and magnetization in static and in pulse fields were measured for polycrystalline “green phase” R 2 BaCuO 5 (R = Sm, Eu, Gd, Dy, Ho, Er, Tm, Yb) samples. Two magnetic phase transitions were found in these compounds at temperatures T N1 and T N2 . An assumption is made that the antiferromagnetic ordering of copper and rare earth subsystem occurs at T N1 and T N2 , respectively. The Dy, Ho and Er compounds have been shown to be metamagnetic at temperatures below T N2 .
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