Doping-Induced Metal-Insulator Transition and the Thermal Transport Properties in Ca3-xYxCo4O9

doi:10.1021/jp911078h

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	Doping-Induced Metal-Insulator Transition and the Thermal Transport Properties in Ca3-xYxCo4O9
	Wang, Yang 1,2; Sui, Yu 1,3; Cheng, Jinguang 1; Wang, Xianjie 1; Su, Wenhui 1; Liu, Xiaoyang 4; Fan, Hong Jin 2
刊名	JOURNAL OF PHYSICAL CHEMISTRY C
	2010-03-25
卷号	114 期号:11 页码:5174-5181
ISSN号	1932-7447
DOI	10.1021/jp911078h
通讯作者	Sui, Yu(suiyu@hit.edu.cn)
英文摘要	We report the electrical, thermal, magnetic, and thermoelectric properties of Y-doped Ca3Co4O9 from 300 down to 5 K. The results indicate that with Y doping, the increase of resistivity originates from the decreases of carrier concentration and mobility, while the increase of Seebeck coefficient is caused by the reduction of carrier concentration together with the enhanced electronic correlation. Point-defect scattering, is the dominant thermal transport mechanism in this system. Due to the considerable difference in mass between Y3+ and Ca2+, thermal conductivity is observably suppressed by doping. The substitution of Y also disturbs the interlayer ferrimagnetic coupling. The ground state of this System converts front ferrimagnetism to paramagnetism gradually. The alteration of transport properties of Ca3-xYxCo4O9 reveals two Crossovers: the transition from Fermi-liquid-like metal to thermally activated semiconductor occuring at x approximate to 0.25, and the transition from thermally activated semiconductor to two-dimensional variable range hopping semiconductor occurring at x approximate to 0.5. The optimal thermoelectric response In Ca3-xYxCo4O9 is found to exist only at the critical state after which the doping-induced metal-insulator transition takes place. Oil the basis of these experimental results, a possible phase diagram for Ca3-xYxCo4O9 is proposed.
资助项目	National Natural Science Foundation of China[50672019] ; National Natural Science Foundation of China[10804024] ; Nanyang Technological University ; Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry ; Harbin Institute of Technology[HIT. NSRIF.2009056]
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
语种	英语
出版者	AMER CHEMICAL SOC
WOS记录号	WOS:000275708600057
资助机构	National Natural Science Foundation of China ; Nanyang Technological University ; Scientific Research Foundation for the Returned Overseas Chinese Scholars, State Education Ministry ; Harbin Institute of Technology
内容类型	期刊论文
源URL	[http://ir.imr.ac.cn/handle/321006/100063]
专题	金属研究所_中国科学院金属研究所
通讯作者	Sui, Yu
作者单位	1.Harbin Inst Technol, Dept Phys, CCMST, Harbin 150001, Peoples R China 2.Nanyang Technol Univ, Sch Math & Phys Sci, Div Phys & Appl Phys, Singapore 637371, Singapore 3.Acad Sinica, Int Ctr Mat Phys, Shenyang 110015, Peoples R China 4.Jilin Univ, Coll Chem, State Key Lab Inorgan Synth & Preparat Chem, Changchun 130012, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yang,Sui, Yu,Cheng, Jinguang,et al. Doping-Induced Metal-Insulator Transition and the Thermal Transport Properties in Ca3-xYxCo4O9[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2010,114(11):5174-5181.
APA	Wang, Yang.,Sui, Yu.,Cheng, Jinguang.,Wang, Xianjie.,Su, Wenhui.,...&Fan, Hong Jin.(2010).Doping-Induced Metal-Insulator Transition and the Thermal Transport Properties in Ca3-xYxCo4O9.JOURNAL OF PHYSICAL CHEMISTRY C,114(11),5174-5181.
MLA	Wang, Yang,et al."Doping-Induced Metal-Insulator Transition and the Thermal Transport Properties in Ca3-xYxCo4O9".JOURNAL OF PHYSICAL CHEMISTRY C 114.11(2010):5174-5181.