Transport and magnetic properties in the Dy1-xCaxVO3 ceramics

Transport and magnetic properties in the Dy1-xCaxVO3 ceramics
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Dy1-xCaxVO3 陶瓷的输运和磁性

DOI:
10.1016/j.jallcom.2013.01.075
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发表时间:
2013-05
影响因子:
6.2
通讯作者:
Yuping Sun
Yuping Sun
中科院分区:
材料科学2区
文献类型:
--
作者:
Bangchuan Zhao;Yanan Huang;Jie Yang;Dongqin Dai;Jianming Dai;Yuping Sun

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研究了Ca掺杂对Dy 1 − xCaxVO 3(0 <$x <$0.2)陶瓷的结构、磁、电和热输运性质的影响。用Ca ~(2+)取代Dy ~(3+),由于引入了离子半径较小的V ~(4+),导致晶格收缩。母体化合物DyVO 3随温度的降低分别经历了三个自旋/轨道有序(OO/SO)转变,分别为TOO,TSO 1和TSO 2.随着Ca掺杂量的增加,DyVO 3体系的TSO 1降低,TSO 1以上和50 K以下的磁化强度降低,TSO 2增加,表明Ca掺杂对DyVO 3体系的有序态有抑制作用。DyVO 3的热电势在TOO附近急剧下降,而Ca掺杂样品中没有观察到这种现象。结果表明,x=0.05的Ca掺杂足以使DyVO 3体系的OO态熔化。随着Ca掺杂量的增加,热电势和电阻率均显著降低。热电势的降低被认为是由于载流子浓度的增加和自旋/轨道简并度的降低共同作用的结果。
The effect of Ca-doping on the structural, magnetic, electrical, and thermal transport properties has been investigated in Dy1−xCaxVO3(0⩽x⩽0.2) ceramics. Substituting Ca2+for Dy3+leads to a shrinkage of lattice due to the introduction of V4+with a smaller ionic radius. The parent compound DyVO3undergoes three spin/orbital ordering (OO/SO) transitions with decreasing temperature at TOO, TSO1and TSO2, respectively. Increasing the doping level of Ca decreases TSO1, the magnetization above TSO1and below 50K, whereas increases TSO2, indicating the Ca-doping has a suppressing effect on the ordering state in DyVO3system. The thermopower of DyVO3decreases sharply near TOOwhile it is not observed in the Ca-doped samples. The result shows that the x=0.05 Ca-doping is sufficient to melt the OO state in DyVO3system. Both the thermopower and resistivity decrease significantly with increasing the Ca-doping content. The decreased thermopower is suggested to originate from the combined effect of the increased carrier concentration and decreased spin/orbital degeneracies.
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