Ru-doping effect on the thermopower and electrical transport properties of misfit-layered Ca3Co4O9+δ

被引：2
|
作者：
Zhang, Dewei [1 ,2 ]
Wang, Zhihe [1 ,3 ]
Xu, Xibin [1 ]
Xu, Xiaonong [1 ]
Qiu, Li [1 ]
Wu, Qisheng [2 ]
Du, Youwei [1 ]
机构：
[1] Nanjing Univ, Natl Lab Solid State Microstruct, Nanjing 210093, Jiangsu, Peoples R China
[2] Yancheng Inst Technol, Dept Mat Engn, Yancheng 224051, Peoples R China
[3] Nanjing Univ, Dept Phys, Ctr Superconducting Phys & Mat, Nanjing 210093, Jiangsu, Peoples R China
来源：
SOLID STATE COMMUNICATIONS | 2016年 / 225卷
基金：
中国国家自然科学基金;
关键词：
Layered cobalt oxide; Spin entropy; Metal-insulator transition; Ru-doping effect; SPIN-ENTROPY ENHANCEMENT; THERMOELECTRIC PROPERTIES;
D O I：
10.1016/j.ssc.2015.10.018
中图分类号：
O469 [凝聚态物理学];
学科分类号：
070205 ;
摘要：
We have studied Ru-doping effect on the thermopower and electrical transport properties of Ca3Co4O9+delta samples. A thermopower in Ca3Co4-xRuxO9+delta was enhanced by Ru doping. A clear field-induced suppression of thermopower implies a large spin entropy contribution. Magnetic results indicate that the spin entropy enhancement originates from the decrease of Co4+ concentration induced by Ru-doping. The increase of resistivity results from the decreases of carrier concentration and mobility. The electrical transport properties reveal that Ru-doping induces a metal-insulator transition at x approximate to 0.2 and the thermally activated mechanism dominates the transport behavior at low temperature. (C) 2015 Elsevier Ltd. All rights reserved.
引用
收藏
页码：27 / 31
页数：5
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