질소 열처리에 따른 $RuSr_2(EuCe)Cu_2O_z$ 계의 구조 및 자기적 특성

초록

Two RuSr2(EuCe)Cu2Oz samples (as prepared and after N2 treatment) have been investigated by thermogravimetric (TC)analysis, high-resolution x-ray powder diffraction and magnetization measurements. TG measurements which were carried out in H2/Ar atmosphere showed that the N2 treatment of the as-prepared sample at 650 ℃ for 2h leads to a decrease in the oxygen content z by about 0.25. This oxygen depletion was accompanied by an increase in the magnetic transition temperature from 54.0 K to 114.9 K. This magnetic behavior is discussed in connection with the results of Rietveld analysis of the x-ray diffraction data which showed that the N2 treatment resulted in both a significant increase in the rotation angle of the RuO6 octahedra and a decrease in c-lattice parameter of the sample.

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