High Temperature Metal-Insulator Transition Induced by Rare-Earth Doping in Perovskite CaMnO(3)

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	High Temperature Metal-Insulator Transition Induced by Rare-Earth Doping in Perovskite CaMnO(3)
	Y. Wang; Y. Sui; J. G. Cheng; X. J. Wang; Z. Lu; W. H. Su
	2009
发表期刊	Journal of Physical Chemistry C
ISSN	1932-7447
卷号	113 期号:28 页码:12509-12516
摘要	This paper reports the crystal structure and high-temperature transport properties of electron-doped perovskite manganites Ca(0.9)R(0.1)MnO(3) (R = La, Pr,..., Yb). All the samples crystallized into a orthorhombic distorted perovskite structure (space group Prima). The structural distortion increases as the average A-site cation size < r(A)> decreases; the average Mn-O-Mn bond angle theta(Mn-O-Mn) monotonously decreases, while the average Mn-O bond length d(Mn-O) exhibits a minimum at R = Dy. The Substitution of R(3+) for Ca(2+) markedly enhances the electrical conductivity of parent CaMnO(3) and induces a metal-insulator transition at T(MI) which varies from 325 K to 420 K with R(3+). Among all the samples, Ca(0.9)Dy(0.1)MnO(3) shows the lowest resistivity and T(MI), mainly because of its shortest d(Mn-O) and largest effective bandwidth W. Thermally activated conductivity is, valid below T(MI), and the activation energy increases slightly with the structural distortion. All of the samples exhibit metallic-like behavior above T(MI). The measurements of magnetic susceptibility and the Seebeck coefficient indicate that the metal-insulator transition with R(3+) doping is induced by the spin-state transition of Mn(3+) ions, and the transition is strongly influenced by the crystal structure. Moreover, the observed T(MI) can be well described as a function of the structural parameters theta(Mn-O-Mn) and the A-site cation size variance sigma(2).
部门归属	[sui, yu] harbin inst technol, dept phys, ccmst, harbin 150001, peoples r china. acad sinica, int ctr mat phys, shenyang 110015, peoples r china.;sui, y (reprint author), harbin inst technol, dept phys, ccmst, harbin 150001, peoples r china;suiyu@hit.edu.cn
关键词	Electron-doped Manganites Neutron-diffraction Thermopower Oxides Transport Oxidation Systems Physics Ca
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/32394
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. High Temperature Metal-Insulator Transition Induced by Rare-Earth Doping in Perovskite CaMnO(3)[J]. Journal of Physical Chemistry C,2009,113(28):12509-12516.
APA	Y. Wang,Y. Sui,J. G. Cheng,X. J. Wang,Z. Lu,&W. H. Su.(2009).High Temperature Metal-Insulator Transition Induced by Rare-Earth Doping in Perovskite CaMnO(3).Journal of Physical Chemistry C,113(28),12509-12516.
MLA	Y. Wang,et al."High Temperature Metal-Insulator Transition Induced by Rare-Earth Doping in Perovskite CaMnO(3)".Journal of Physical Chemistry C 113.28(2009):12509-12516.