Electronic Conduction in Slightly Reduced Strontium Titanate at Low Temperatures

“…Under Ar + irradiation a nanometric layer of the material becomes conductive [5,10,11] exhibiting similar properties than STO/LAO interfaces [6] and bulk reduced STO [12][13][14][15]. Although those materials have been extensively studied, the irradiated STO properties have been poorly studied.…”

Section: Introductionmentioning

confidence: 99%

Noise and electric field characterization of irradiated SrTiO₃

Guerrero¹,

Solignac²,

Pannetier‐Lecœur³

et al. 2011

J. Phys.: Conf. Ser.

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Abstract. SrTiO3 (STO) is a band insulator with a perovskite crystallographic structure, widely used as substrate for the deposition of other perovskite materials, for instance manganites or cuprates. STO surface becomes conductive under Ar + ion irradiation, exhibiting similar properties to STO/LaAlO 3 interface or bulk reduced STO. We report the transport and noise properties as function of temperature and electric field of Ar + irradiated STO exhibiting at its surface a high mobility electron gas. This system shows metallic properties with low charge densities allowing mobility measurements. The low frequency 1/f noise presents an unexpected linear dependence with the mobility which cannot be described by the usual Hooge model. The effect of the electric field at a given temperature on the mobility, magnetoresistance and low frequency noise is also presented.

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“…The dependence of the mobility H on the carrier density n for different doped STO single crystals [13,14] is presented in Fig. 4(a).…”

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High Mobility inLaAlO3/SrTiO3Heterostructures: Origin, Dimensionality, and Perspectives

et al. 2007

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We have investigated the dimensionality and origin of the magnetotransport properties of LaAlO3 films epitaxially grown on TiO2-terminated SrTiO3(001) substrates. High-mobility conduction is observed at low deposition oxygen pressures (P(O2)<10(-5) mbar) and has a three-dimensional character. However, at higher P(O2) the conduction is dramatically suppressed and nonmetallic behavior appears. Experimental data strongly support an interpretation of these properties based on the creation of oxygen vacancies in the SrTiO3 substrates during the growth of the LaAlO3 layer. When grown on SrTiO3 substrates at low P(O2), other oxides generate the same high mobility as LaAlO3 films. This opens interesting prospects for all-oxide electronics.

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Electronic Conduction in Slightly Reduced Strontium Titanate at Low Temperatures

Cited by 97 publications

References 23 publications

Defect-induced ferromagnetism in crystalline SrTiO3

Defect-induced ferromagnetism in crystalline SrTiO3

Noise and electric field characterization of irradiated SrTiO₃

High Mobility inLaAlO3/SrTiO3Heterostructures: Origin, Dimensionality, and Perspectives

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Electronic Conduction in Slightly Reduced Strontium Titanate at Low Temperatures

Cited by 97 publications

References 23 publications

Defect-induced ferromagnetism in crystalline SrTiO3

Defect-induced ferromagnetism in crystalline SrTiO3

Noise and electric field characterization of irradiated SrTiO3

High Mobility inLaAlO3/SrTiO3Heterostructures: Origin, Dimensionality, and Perspectives

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Noise and electric field characterization of irradiated SrTiO₃