Synthesis, structure, and magnetic characterization of La2-xRxRuO5 (R = Pr, Nd, Sm, Gd, Dy)

被引:10
作者
Riegg, S. [1 ]
Sazama, U. [2 ]
Froeba, M. [2 ]
Reller, A.
Ebbinghaus, S. G. [3 ]
机构
[1] Univ Augsburg, Ctr Elect Correlat & Magnetism, D-86135 Augsburg, Germany
[2] Univ Hamburg, D-20146 Hamburg, Germany
[3] Univ Halle Wittenberg, D-06099 Halle, Germany
来源
PHYSICAL REVIEW B | 2011年 / 84卷 / 01期
关键词
CRYSTAL-STRUCTURE; POWDER DIFFRACTOMETER; HIGH-TEMPERATURE; LA2RUO5; DIFFRACTION; TRANSITION; PYROCHLORES; PHASES;
D O I
10.1103/PhysRevB.84.014403
中图分类号
T [工业技术];
学科分类号
08 ;
摘要
Polycrystalline samples of La2-xRxRuO5 (R = Pr, Nd, Sm, Gd, Dy) have been prepared, applying a soft-chemistry route based on the thermal decomposition of citric acid precursors. By powder x-ray and neutron diffraction the crystal structures have been investigated in detail. For the unsubstituted parent compound La2RuO5, synchrotron x-ray diffraction patterns reveal a broad structural phase transition regime around 170 K without any significant hysteresis. This structural transition is linked with a drastic reduction of the magnetic susceptibility. A similar behavior was also observed for the lanthanide-substituted compounds La2-xRxRuO5. Magnetic measurements reveal the coexistence of two weakly interacting magnetic sublattices. The effect of rare-earth substitution on the magnetic phase transition is resulting from structural modifications caused by the smaller radius of the R3+ ions. These ions are predominantly located within the LaO-layers, which are alternating with LaRuO4 layers. The transition temperatures determined by differential scanning calorimetry (DSC) are compared to data derived from the susceptibility measurements.
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页数:12
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