Low temperature magnetic transition in RuSr2EuCeCu2O10 ruthenocuprate

Details Low temperature magnetic transition in RuSr2EuCeCu2O10 ruthenocuprate Low temperature magnetic transition in RuSr2EuCeCu2O10 ruthenocuprate

2006-11-22

arxiv.org/abs/cond-mat/0611579v1

Physics

Condensed Matter

Strongly Correlated Electrons

to be published in Physica C

Scientific paper

A new magnetic transition in the ruthenocuprate parent compound RuSr2EuCeCu2O10 has been observed below 10 K. It shows up only as a kink in the imaginary part of the ac susceptibility and exhibits a pronounced frequency dependence. At the same time, the real part of the ac susceptibility and the dc magnetization study show very little change in the same temperature window suggesting only a minor fraction of the material to be involved in the transition. Frequency dependence shows excellent agreement with the predictions of the Arrhenius law known to describe well the dynamics of the superparamagnetic particles. The same type of the investigation on the RuSr2Eu1.1Ce0.9Cu2O10 composition showed no evidence of the similar transition, which points to a possible intrinsic behavior.

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