Abstract
The magnetization of single crystals of the cuprates Dy2BaCuO5 and Ho2BaCuO5 along different crystallographic directions is measured using a SQUID magnetometer in fields up to 54 kOe. Spectroscopic investigations of the exchange splitting of the levels of Er3+ probe ions in these cuprates are also performed. It is shown that the cuprates investigated are highly anisotropic antiferromagnets, which display quasi-Ising behavior in a magnetic field. The nature of the two spontaneous magnetic phase transitions detected in Dy2BaCuO5 and Ho2BaCuO5 is analyzed. It is shown that the low-temperature transition is due to an increase in rare-earth-copper exchange.
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