Hall effect measurements on strained and unstrained thin films of La0.7Ca0.3MnO3 and La0.7Sr0.3MnO3

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	Hall effect measurements on strained and unstrained thin films of La0.7Ca0.3MnO3 and La0.7Sr0.3MnO3
	I. M. Dildar; C. Beekman; X. He; J. Aarts
	2012
发表期刊	Physical Review B
ISSN	1098-0121
卷号	85 期号:20
摘要	We have studied the Hall effect in thin films of La0.7Ca0.3MnO3 and La0.7Sr0.3MnO3 deposited on SrTiO3 (STO), NdGaO3 (NGO), and LaSrGaO3 (LSGO) substrates in a temperature range from below (10 K) to above (400 K) the metal-insulator transition, in magnetic fields up to 9 T, and for thicknesses between 7 and 75 nm. The charge-carrier density as calculated from the Hall voltage in a single-band picture shows bulklike values for the thick films, but a significant decrease in thin films (below 20 nm), both for strained thin films (on STO) and unstrained thin films on NGO, although less in the case of LSGO. It is well known, however, that a single-band model is not appropriate for the manganates, in which both electron and hole surfaces occur simultaneously. We therefore analyzed the data in a two-band scenario. We still come to the conclusion that the carrier density in the thin films, both strained and unstrained, is lower than in the thicker bulklike films. We discuss this in terms of charge discontinuities at the various interfaces, which appear to play a significant role.
部门归属	[dildar, i. mubeen; beekman, c.; aarts, j.] leiden univ, kamerlingh onnes lab, nl-2300 ra leiden, netherlands. [he, xin] inst met sci & technol, shenyang natl lab mat sci, shenyang 110016, peoples r china.;dildar, im (reprint author), leiden univ, kamerlingh onnes lab, nl-2300 ra leiden, netherlands.;aarts@physics.leidenuniv.nl
关键词	Colossal Magnetoresistance Manganites Manganese Perovskites Phase Transport La0.67ca0.33mno3 Disorder
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文献类型	期刊论文
条目标识符	http://ir.imr.ac.cn/handle/321006/59927
专题	中国科学院金属研究所
推荐引用方式 GB/T 7714	I. M. Dildar,C. Beekman,X. He,et al. Hall effect measurements on strained and unstrained thin films of La0.7Ca0.3MnO3 and La0.7Sr0.3MnO3[J]. Physical Review B,2012,85(20).
APA	I. M. Dildar,C. Beekman,X. He,&J. Aarts.(2012).Hall effect measurements on strained and unstrained thin films of La0.7Ca0.3MnO3 and La0.7Sr0.3MnO3.Physical Review B,85(20).
MLA	I. M. Dildar,et al."Hall effect measurements on strained and unstrained thin films of La0.7Ca0.3MnO3 and La0.7Sr0.3MnO3".Physical Review B 85.20(2012).