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

页码：27 / 31

页数：5

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