High Temperature Metal-Insulator Transition Induced by Rare-Earth Doping in Perovskite CaMnO3

doi:10.1021/jp809049s

IMR OpenIR

	High Temperature Metal-Insulator Transition Induced by Rare-Earth Doping in Perovskite CaMnO3
	Wang, Yang ; Sui, Yu 1; Cheng, Jinguang ; Wang, Xianjie ; Lu, Zhe ; Su, Wenhui
通讯作者	Sui, Yu(suiyu@hit.edu.cn)
	2009-07-16
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 Ca0.9R0.1MnO3 (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 R3+ for Ca2+ markedly enhances the electrical conductivity of parent CaMnO3 and induces a metal-insulator transition at T-MI which varies from 325 K to 420 K with R3+. Among all the samples, Ca0.9Dy0.1MnO3 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 R3+ doping is induced by the spin-state transition of Mn3+ 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).
资助者	National Natural Science Foundation of China
DOI	10.1021/jp809049s
收录类别	SCI
语种	英语
资助项目	National Natural Science Foundation of China[50672019]
WOS研究方向	Chemistry ; Science & Technology - Other Topics ; Materials Science
WOS类目	Chemistry, Physical ; Nanoscience & Nanotechnology ; Materials Science, Multidisciplinary
WOS记录号	WOS:000268139500073
出版者	AMER CHEMICAL SOC
引用统计	被引频次：51[WOS] [WOS记录] [WOS相关记录]
文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/97699
专题	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.Acad Sinica, Int Ctr Mat Phys, Shenyang 110015, Peoples R China
推荐引用方式 GB/T 7714	Wang, Yang,Sui, Yu,Cheng, Jinguang,et al. High Temperature Metal-Insulator Transition Induced by Rare-Earth Doping in Perovskite CaMnO3[J]. JOURNAL OF PHYSICAL CHEMISTRY C,2009,113(28):12509-12516.
APA	Wang, Yang,Sui, Yu,Cheng, Jinguang,Wang, Xianjie,Lu, Zhe,&Su, Wenhui.(2009).High Temperature Metal-Insulator Transition Induced by Rare-Earth Doping in Perovskite CaMnO3.JOURNAL OF PHYSICAL CHEMISTRY C,113(28),12509-12516.
MLA	Wang, Yang,et al."High Temperature Metal-Insulator Transition Induced by Rare-Earth Doping in Perovskite CaMnO3".JOURNAL OF PHYSICAL CHEMISTRY C 113.28(2009):12509-12516.