Thickness and strain effects on electronic transport and Curie temperature in La0.67Ca0.33MnO3 films

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	Thickness and strain effects on electronic transport and Curie temperature in La0.67Ca0.33MnO3 films
	Xiong, CM ; Sun, JR ; Wang, DJ ; Shen, BG
刊名	ACTA PHYSICA SINICA
	2004
卷号	53 期号:11 页码:3909
关键词	GIANT MAGNETORESISTANCE LA0.7CA0.3MNO3 LA1-XSRXMNO3 MANGANITES MAGNETOTRANSPORT RESISTIVITY STATES MN
ISSN号	1000-3290
通讯作者	Xiong, CM (reprint author), Chinese Acad Sci, Inst Phys, State Key Lab Magnetism, Beijing 100080, Peoples R China.
中文摘要	La0.67Ca0.33MnO3 films with thickness between 25 and 400nm were fabricated on (001) SrTiO3 and (001) LaAlO3 substrates, using pulsed laser deposition. The magnetization and resistivity p of the films were studied as functions of thickness. The reduction of t causes the decrease of the Curie temperature T-C in addition to the increase of p of the films. Compared with the compressive strain in the La0.67Ca0.33MnO3/LaAlO3 films I the tensile strain in the La0.67Ca0.33MnO3/SrTiO3 films causes a faster reduction of T-C with t, and a larger value of rho(0). The low-temperature rho is found to follow well rho = rho(0) + Bomega(s)/sinh(2) (homega(s)/2k(B)T) + CTn, with rho(0) being the residual resistivity. The second term arises from the scattering by a soft optical phonon mode, and the third term denotes the other possible transport mechanisms. B, omega(s) ( the frequency of a soft optical mode) and C are fitting parameters. At temperatures higher than T-C, rho of all the films show activated conduction with rho = DTexp(E-a/k(B) T). Here, E-a is the activation energy. Based on the investigation of rho(0), omega(s) and E-a,E- the thickness and strain effects in the films are discussed, separately. Further study shows that the variation of T-C is mainly associated with E-a and omega(a), confirming the crucial role of the electron-phonon coupling in the strain effects on T-C.
收录类别	SCI
语种	中文
公开日期	2013-09-23
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/45815]
专题	物理研究所_物理所公开发表论文_物理所公开发表论文_期刊论文
推荐引用方式 GB/T 7714	Xiong, CM,Sun, JR,Wang, DJ,et al. Thickness and strain effects on electronic transport and Curie temperature in La0.67Ca0.33MnO3 films[J]. ACTA PHYSICA SINICA,2004,53(11):3909.
APA	Xiong, CM,Sun, JR,Wang, DJ,&Shen, BG.(2004).Thickness and strain effects on electronic transport and Curie temperature in La0.67Ca0.33MnO3 films.ACTA PHYSICA SINICA,53(11),3909.
MLA	Xiong, CM,et al."Thickness and strain effects on electronic transport and Curie temperature in La0.67Ca0.33MnO3 films".ACTA PHYSICA SINICA 53.11(2004):3909.