Study on the stability of charge-ordered state and rectifying properties of heteroepitaxial structure for manganites

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	Study on the stability of charge-ordered state and rectifying properties of heteroepitaxial structure for manganites
	T. Qian; T. F. Zhou; X. G. Li
	2008
发表期刊	Journal of Electroceramics
ISSN	1385-3449
卷号	21 期号:1-4 页码:85-90
摘要	We report the study on the stability of charge-ordered (CO) state and rectifying properties of heteroepitaxial structure for manganites R(1-x)Ca(x)MnO(3) (R = La, Pr, and Sm) by measuring magnetoresistance, magnetization, specific heat, 1-v characteristics, and X-ray diffraction. For the La(1-x)Ca(x)MnO(3) system, near the Ca(2+) concentration of x=0.75 the CO state is mostly stabilized and insensitive to external magnetic fields, which is supported by the charge transport, magnetic, and specific heat properties. By analyzing powder X-ray diffraction patterns, we found that the Jahn-Teller (JT) distortion in the CO state is the largest at x=0.75, which confirms the close relationship between the JT lattice distortion and the stability of the CO state for La(1-x)Ca(x)MnO(3). The stability of the CO state is also related to the A-site average ionic radius, < r(A)>. With decreasing the radius of the doped rare-earth elements (La, Pr, and Sm), the most stable CO state for the each doped system shifts gradually toward lower Ca(2+) concentration. In addition, we have fabricated simple p-n junctions using a heteroepitaxial structure of La(1-x)Ca(x)MnO(3)/Nb-doped SrTiO(3). These junctions show good rectifying properties for temperature from 85 to 305 K. The photovoltage as a function of light wavelength at room temperature has also been studied and the maximum photovoltage can reach 180 mV. The good rectifying behaviors and strong photovoltaic effect make these simple p-n junctions promising for applications.
部门归属	[qian, t.; zhou, t. f.; li, x. g.] univ sci & technol china, hefei natl lab phys sci microscale, hefei 230026, peoples r china. [qian, t.; zhou, t. f.; li, x. g.] acad sinica, int ctr mat phys, shenyang 110015, peoples r china.;li, xg (reprint author), univ sci & technol china, hefei natl lab phys sci microscale, hefei 230026, peoples r china;lixg@ustc.edu.cn
关键词	Manganites Charge Ordering Jahn-teller Distortion Heterojunction La1-xcaxmno3 Transitions Field
URL	查看原文
WOS记录号	WOS:000262833200017
引用统计	被引频次：2[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/321006/33051
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	T. Qian,T. F. Zhou,X. G. Li. Study on the stability of charge-ordered state and rectifying properties of heteroepitaxial structure for manganites[J]. Journal of Electroceramics,2008,21(1-4):85-90.
APA	T. Qian,T. F. Zhou,&X. G. Li.(2008).Study on the stability of charge-ordered state and rectifying properties of heteroepitaxial structure for manganites.Journal of Electroceramics,21(1-4),85-90.
MLA	T. Qian,et al."Study on the stability of charge-ordered state and rectifying properties of heteroepitaxial structure for manganites".Journal of Electroceramics 21.1-4(2008):85-90.