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题名: High Temperature Metal-Insulator Transition Induced by Rare-Earth Doping in Perovskite CaMnO(3)
作者: Y. Wang;  Y. Sui;  J. G. Cheng;  X. J. Wang;  Z. Lu;  W. H. Su
发表日期: 2009
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).
KOS主题词: Neutrons--Diffraction;  Thermoelectricity;  Oxides;  Transportation;  Oxidation;  SYSTEMS;  Physics;  Calcium
刊名: Journal of Physical Chemistry C
相关网址: <Go to ISI>://WOS:000268139500073
Appears in Collections:中国科学院金属研究所_期刊论文

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Recommended Citation:
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.

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