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Effect of Nitrogen Treatment on the Structure and Magnetic Properties of $RuSr_2(EuCe)Cu_2O_z$ Compound  

Lee, H.K. (Department of Physics, Kangwon National University)
Kim, Y.I. (Korea Research Institute of Standards and Science)
Kim, Y.C. (Department of Physics, Pusan National University)
Publication Information
Progress in Superconductivity / v.13, no.3, 2012 , pp. 178-183 More about this Journal
Abstract
Two $RuSr_2(EuCe)Cu_2O_z$ samples (as prepared and after $N_2$ treatment) have been investigated by thermogravimetric (TC) analysis, high-resolution x-ray powder diffraction and magnetization measurements. TG measurements which were carried out in $H_2/Ar$ atmosphere showed that the $N_2$ treatment of the as-prepared sample at $650^{\circ}C$ 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 $N_2$ treatment resulted in both a significant increase in the rotation angle of the $RuO_6$ octahedra and a decrease in c-lattice parameter of the sample.
Keywords
$Ru,Sr_2(Eu,Ce)Cu_2O_z$; $N_2$ treatment; structure; magnetic property; Rietveld analysis;
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