Superconducting and magnetic properties of Ru1-yMySr2Eu2-xCexCu2O10+δ (M=Nb,Sn)

초록

We have investigated the effects of isoelectronic Nb(5+) and hole-doping Sn(4+) substitutions for Ru(5+) on the magnetic and electronic properties of RuSr(2)Eu(2-x)Ce(x)Cu(2)O(10+delta) that displays superconductivity and magnetic order. We find a rapid increase in the Meissner state onset temperature when the magnetic order is completely destroyed by Sn substitution, which we show is consistent with the spontaneous vortex phase model. The temperature characterizing the ferromagnetic component, T(M)(*), and the saturation magnetization, M(s), decreases more rapidly for hole-doping by Sn than for nearly isoelectronic doping by Nb. We propose a ferrimagnetic picture to explain the magnetization data.

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