Doping-Induced Metal-Insulator Transition and the Thermal Transport Properties in Ca(3-x)Y(x)Co(4)O(9)

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	Doping-Induced Metal-Insulator Transition and the Thermal Transport Properties in Ca(3-x)Y(x)Co(4)O(9)
	Y. Wang; Y. Sui; J. G. Cheng; X. J. Wang; W. H. Su; X. Y. Liu; H. J. Fan
	2010
发表期刊	Journal of Physical Chemistry C
ISSN	1932-7447
卷号	114 期号:11 页码:5174-5181
摘要	We report the electrical, thermal, magnetic, and thermoelectric properties of Y-doped Ca(3)Co(4)O(9) 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 Y(3+) and Ca(2+), 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 Ca(3-x)Y(x)Co(4)O(9) 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 Ca(3-x)Y(x)Co(4)O(9) 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 Ca(3-x)Y(x)Co(4)O(9) is proposed.
部门归属	[wang, yang; sui, yu; cheng, jinguang; wang, xianjie; su, wenhui] harbin inst technol, dept phys, ccmst, harbin 150001, peoples r china. [wang, yang; fan, hong jin] nanyang technol univ, sch math & phys sci, div phys & appl phys, singapore 637371, singapore. [sui, yu] acad sinica, int ctr mat phys, shenyang 110015, peoples r china. [liu, xiaoyang] jilin univ, coll chem, state key lab inorgan synth & preparat chem, changchun 130012, peoples r china.;sui, y (reprint author), harbin inst technol, dept phys, ccmst, harbin 150001, peoples r china;suiyu@hit.edu.cn fanhj@ntu.edu.sg
关键词	Temperature Thermoelectric Properties Giant Magnetoresistance Solid-solutions Conductivity Electron System ca3co4o9+delta Thermopower Crystals Behavior
URL	查看原文
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/31536
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	Y. Wang,Y. Sui,J. G. Cheng,et al. Doping-Induced Metal-Insulator Transition and the Thermal Transport Properties in Ca(3-x)Y(x)Co(4)O(9)[J]. Journal of Physical Chemistry C,2010,114(11):5174-5181.
APA	Y. Wang.,Y. Sui.,J. G. Cheng.,X. J. Wang.,W. H. Su.,...&H. J. Fan.(2010).Doping-Induced Metal-Insulator Transition and the Thermal Transport Properties in Ca(3-x)Y(x)Co(4)O(9).Journal of Physical Chemistry C,114(11),5174-5181.
MLA	Y. Wang,et al."Doping-Induced Metal-Insulator Transition and the Thermal Transport Properties in Ca(3-x)Y(x)Co(4)O(9)".Journal of Physical Chemistry C 114.11(2010):5174-5181.