Splitting of low-temperature magnetic transition in Dy2BaCuO5
Popova M. N. , Chepurko G. G.
The optical spectra of the "green phase" of Dy2BaCu05 and of the dilute compound Dy0 02 Yj 98 BaCu05 have been studied. The low-temperature magnetic transition in Dy2BaCu05 was found to split into two first-order phase transitions: at TN2 = Π-26 К the rare-earth subsystem becomes ordered; the transition that follows at TR =11.08 К evidently corresponds to a spin reversal. The copper subsystem becomes ordered at TN] = 20 + 0.5 К in Dy2BaCu05 and for TN = 14.5KinDy0.o2Yi.98BaCu05.
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![](/ps/1161/article_17562_800_head.png "The optical spectra of the "green phase" of Dy<sub>2</sub>BaCu0<sub>5</sub> and of the dilute compound Dy<sub>0</sub> 02 Yj <sub>98</sub> BaCu0<sub>5</sub> have been studied. The low-temperature magnetic transition in Dy<sub>2</sub>BaCu0<sub>5</sub> was found to split into two first-order phase transitions: at <i>T<sub>N2</sub> = </i>Π-26 К the rare-earth subsystem becomes ordered; the transition that follows at <i>T<sub>R</sub> </i>=11.08 К evidently corresponds to a spin reversal. The copper subsystem becomes ordered at <i>T<sub>N]</sub> = </i>20 + 0.5 К in Dy<sub>2</sub>BaCu0<sub>5</sub> and for <i>T<sub>N</sub> = </i>14.5KinDy<sub>0</sub>.o<sub>2</sub>Yi.98BaCu0<sub>5</sub>.")