Abstract
We report on magnetic investigation on PrBa2Cu3O6+x compounds (0.4 < x < 1.0) where the Pr3+ ions exhibit an antiferromagnetic order (AF) at TN ∼ 11 K for x ∼ 0.5 and 17 K for x ∼ 1. For better understanding of the role of the praseodymium and oxygen content on magnetic and transport properties, we measured temperature and field dependence of susceptibility and magnetization of PrBa2Cu3O6+x in two oxygenation states x = 0.4 and 0.9. We show that a careful analysis of these data can bring to evidence the existence of several tiny transitions, especially a sharp one around 13 K which may be related to a change of direction of copper moments. (© 2004 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim)
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