Optical properties of nb-doped SrTiO3 single crystal

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	Optical properties of nb-doped SrTiO3 single crystal
	Ma, JY ; Bi, CZ ; Fang, X ; Zhao, HY ; Kamran, M ; Qiu, XG
刊名	PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS
	2007
卷号	463 页码:107
ISSN号	0921-4534
中文摘要	We have fabricated magnetic III-V compound semiconductor resonant tunnelling diodes (RTD's) based on a (Ga,Mn)As material system. The RTD's contain a ferromagnetic Mn-doped emitter, where the Mn-concentration was chosen on both sides of the metal-insulator (M-I) transition. The measured I- V characteristics show that large magnetoresistance (MR) is not present in non-magnetic RTD's without the Mn-doping. In the case of the metallic emitter the observed positive MR is interpreted as an evidence of the magnetization-dependent tunnelling related to the exchange interaction between the hole spins and the localised spins of the 3d electrons in the ferromagnetic (Ga, Mn)As layer. Especially, the contributions from the spin-dependent tunnelling described by the Tsu-Esaki model and from the tunnelling anisotropic magnetoresistance, which was found recently in magnetic tunnel diodes, are discussed. The measured large MR in the I-V characteristics of the magnetic RTD's, which have an emitter on the semiconducting side of the M-I transition, is explained by a simple series resistance model for the magnetic emitter, where the conduction in the Anderson localized states below the mobility edge becomes magnetic field-dependent due to the Mn-doping. (C) 2007 WILEY-VCH Verlag GmbH & Co. KGaA, Weinheim
收录类别	SCI
公开日期	2013-09-24
内容类型	期刊论文
源URL	[http://ir.iphy.ac.cn/handle/311004/50342]
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	Ma, JY,Bi, CZ,Fang, X,et al. Optical properties of nb-doped SrTiO3 single crystal[J]. PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS,2007,463:107.
APA	Ma, JY,Bi, CZ,Fang, X,Zhao, HY,Kamran, M,&Qiu, XG.(2007).Optical properties of nb-doped SrTiO3 single crystal.PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS,463,107.
MLA	Ma, JY,et al."Optical properties of nb-doped SrTiO3 single crystal".PHYSICA C-SUPERCONDUCTIVITY AND ITS APPLICATIONS 463(2007):107.