Enhanced electron correlation in rare-earth doped Ca3Co4O9

被引：51

作者：

Wang, Yang ^{[1
,2
]}

Xu, Luxiang ^{[3
,4
]}

Sui, Yu ^{[1
,5
]}

Wang, Xianjie ^{[1
]}

Cheng, Jinguang ^{[1
]}

Su, Wenhui ^{[1
]}

机构：

[1] Harbin Inst Technol, CCMST, Dept Phys, Harbin 150001, Peoples R China

[2] Nanyang Technol Univ, Sch Phys & Math Sci, Div Phys & Appl Phys, Singapore 637371, Singapore

[3] Sichuan Normal Univ, Inst Solid State Phys, Lab Low Dimens Struct Phys, Chengdu 610068, Peoples R China

[4] Sichuan Normal Univ, Sch Phys & Elect Engn, Chengdu 610068, Peoples R China

[5] Acad Sinica, Int Ctr Mat Phys, Shenyang 110015, Peoples R China

来源：

APPLIED PHYSICS LETTERS | 2010年 / 97卷 / 06期

关键词：

calcium compounds; carrier density; doping profiles; electron correlations; rare earth metals; specific heat; thermoelectric power; MISFIT-LAYERED COBALTITE; THERMOELECTRIC PROPERTIES; SYSTEM; SUBSTITUTION; TRANSITION; TRANSPORT; CERAMICS;

D O I：

10.1063/1.3479923

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

Thermoelectric and thermodynamic properties of a series of Ca-site rare-earth R3+ doped Ca3Co4O9 were investigated. For a fixed doping level, with the reduction in R3+ radius, thermopower is found to gradually increase despite the carrier concentration remains unchanged. The scaling behavior between thermopower and electron specific heat coefficient reveals that the additional increase in thermopower originates from enhanced electron correlation which may be attributed to doping-induced chemical pressure. (C) 2010 American Institute of Physics. [doi:10.1063/1.3479923]

引用

页数：3

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