Magnetic phase diagrams based on static and dynamic magnetic behaviour in Ru-based superconducting ferromagnets

摘要

In this work, we present magnetic phase diagrams of a RuSr_2Eu_(1.5)Ce_(0.5)Cu_2O_10 (Ru-1222) superconducting ferromagnet derived from its static and dynamic magnetic responses, measured by temperature and field dependences of dc magnetization and nonlinear ac susceptibility in both low and high magnetic fields. Comparison of magnetic phase diagrams of phase pure and impure samples singles out the intrinsic and extrinsic magnetic features, naturally proposing a unified model of Ru-1222 magnetic behaviour. The results considered within the proposed interpretation indicate full agreement between static and dynamic properties which, if measured in combination, effectively complement each other, uncovering existing ambiguities.