Ruthenocuprates RuSr2(Eu,Ce)(2)Cu2O10-y: Intrinsic magnetic multilayers
We report ac susceptibility data on RuSr2(Eu,Ce)(2)Cu2O10-y (Ru-1222, Ce content x=0.5 and 1.0), RuSr2GdCu2O8 (Ru-1212), and SrRuO3. Both Ru-1222 (x=0.5, 1.0) sample types exhibit unexpected magnetic dynamics in low magnetic fields: logarithmic time relaxation, switching behavior, and "inverted" hysteresis loops. Neither Ru-1212 nor SrRuO3 exhibit such magnetic dynamics. The results are interpreted as evidence of the complex magnetic order in Ru-1222. We propose a specific multilayer model to explain the data, and note that superconductivity in the ruthenocuprate is compatible with both the presence and absence of the magnetic dynamics.
Inst Phys, HR-10000 Zagreb, Croatia. Univ Wisconsin, Dept Phys, Madison, WI 53706 USA. Ecole Polytech Fed Lausanne, Inst Phys Appl, CH-1012 Lausanne, Switzerland. Hebrew Univ Jerusalem, Racah Inst Phys, IL-91904 Jerusalem, Israel. Zivkovic, I, Inst Phys, POB 304, HR-10000 Zagreb, Croatia. ISI Document Delivery No.: 541HZ 144420
Record created on 2006-10-03, modified on 2016-08-08